Table of Contents


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
     
FORM 10-K
     
xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20142016

or
¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                    to                    

Commission
File Number
 
Name of Registrant, State of Incorporation,
Address of Principal Executive Offices and Telephone Number
 
IRS Employer
Identification Number
1-9894 ALLIANT ENERGY CORPORATION 39-1380265
  (a Wisconsin corporation)  
  4902 N. Biltmore Lane  
  Madison, Wisconsin 53718  
  Telephone (608) 458-3311  
   
1-4117 INTERSTATE POWER AND LIGHT COMPANY 42-0331370
  (an Iowa corporation)  
  Alliant Energy Tower  
  Cedar Rapids, Iowa 52401  
  Telephone (319) 786-4411  
   
0-337 WISCONSIN POWER AND LIGHT COMPANY 39-0714890
  (a Wisconsin corporation)  
  4902 N. Biltmore Lane  
  Madison, Wisconsin 53718  
  Telephone (608) 458-3311  
This combined Form 10-K is separately filed by Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company. Information contained in the Form 10-K relating to Interstate Power and Light Company and Wisconsin Power and Light Company is filed by each such registrant on its own behalf. Each of Interstate Power and Light Company and Wisconsin Power and Light Company makes no representation as to information relating to registrants other than itself.

Securities registered pursuant to Section 12(b) of the Act:
 Title of ClassName of Each Exchange on Which Registered
Alliant Energy CorporationCommon Stock, $0.01 Par ValueNew York Stock Exchange
Alliant Energy CorporationCommon Share Purchase RightsNew York Stock Exchange
Interstate Power and Light Company5.100% Series D Cumulative Perpetual Preferred Stock, $0.01 Par ValueNew York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrants are well-known seasoned issuers, as defined in Rule 405 of the Securities Act.
Yes x  No  ¨

Indicate by check mark if the registrants are not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
Yes ¨  No  x
Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports) and (2) have been subject to such filing requirements for the past 90 days.    Yes x  No  ¨
Indicate by check mark whether the registrants have submitted electronically and posted on their corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrants were required to submit and post such files).    Yes x  No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrants’ knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. x
Indicate by check mark whether the registrants are large accelerated filers, accelerated filers, non-accelerated filers, or smaller reporting companies. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.
 Large Accelerated Filer Accelerated Filer Non-accelerated Filer Smaller Reporting Company Filer
Alliant Energy Corporationx      
Interstate Power and Light Company    x  
Wisconsin Power and Light Company    x  

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Exchange Act).    Yes ¨  No  x

The aggregate market value of the voting and non-voting common equity held by nonaffiliates as of June 30, 20142016:
Alliant Energy Corporation$6.79.0 billion
Interstate Power and Light Company$—
Wisconsin Power and Light Company$—
Number of shares outstanding of each class of common stock as of January 30, 201531, 2017:
Alliant Energy CorporationCommon stock, $0.01 par value, 110,935,680227,687,330 shares outstanding
  
Interstate Power and Light CompanyCommon stock, $2.50 par value, 13,370,788 shares outstanding (all of which are owned beneficially and of record by Alliant Energy Corporation)
  
Wisconsin Power and Light CompanyCommon stock, $5 par value, 13,236,601 shares outstanding (all of which are owned beneficially and of record by Alliant Energy Corporation)

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement relating to Alliant Energy Corporation’s 20152017 Annual Meeting of Shareowners are, or will be upon filing with the Securities and Exchange Commission, incorporated by reference into Part III hereof.





TABLE OF CONTENTS
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19. Discontinued Operations and Assets and Liabilities Held for Sale
   
 
 
 
 
 
 
 
  





DEFINITIONS

The following abbreviations or acronyms used in this Form 10-K are defined below:
Abbreviation or AcronymDefinitionAbbreviation or AcronymDefinition
20152017 Alliant Energy Proxy StatementAlliant Energy’s Proxy Statement for the 20152017 Annual Meeting of ShareownersHDDHeating degree days
AEFAlliant Energy Finance, LLCIPLInterstate Power and Light Company
AFUDCAllowance for funds used during constructionIRSInternal Revenue Service
Alliant EnergyAlliant Energy Corporation
ANRITCANR PipelineITC Midwest LLC
AOCLAccumulated other comprehensive lossIUBIowa Utilities Board
AROAsset retirement obligation
ARRKWhAuction revenue right
ARRAAmerican Recovery and Reinvestment Act of 2009Kilowatt-hour
ATCAmerican Transmission Company LLCMarshalltownMarshalltown Generating Station
ATIAE Transco Investments, LLC
Audit CommitteeAudit Committee of the Board of Directors
BARTBest available retrofit technology
Bent TreeBent Tree - Phase I wind project
CACertificate of authority
CAAClean Air Act
CAIRClean Air Interstate Rule
CAOChief Accounting Officer
Cash Balance PlanAlliant Energy Cash Balance Pension Plan
CAVRClean Air Visibility Rule
CCRCoal combustion residuals
CDDCooling degree days
CEOChief Executive Officer
CFOChief Financial Officer
CO2Carbon dioxide
CO2eCarbon dioxide-equivalent
ColumbiaColumbia Energy Center
Corporate ServicesAlliant Energy Corporate Services, Inc.
CourtU.S. District Court for the Western District of Wisconsin
CPCNCertificate of Public Convenience and Necessity
CRANDICCedar Rapids and Iowa City Railway Company
CSAPRCross-State Air Pollution Rule
CWIPConstruction work in progress
DAECDuane Arnold Energy Center
D.C. Circuit CourtU.S. Court of Appeals for the D.C. Circuit
DCPAlliant Energy Deferred Compensation Plan
DLIPAlliant Energy Director Long Term Incentive Plan
DNRDepartment of Natural Resources
DthDekatherm
EdgewaterEdgewater Generating Station
EECREnergy efficiency cost recovery
EEPEnergy efficiency plan
EGUElectric generating unit
EmeryEmery Generating Station
EPAU.S. Environmental Protection Agency
EPBEmissions plan and budget
EPSEarnings per weighted average common share
EVPExecutive Vice President
FASBFinancial Accounting Standards Board
FCSFirm Citygate Supplies
FERCFederal Energy Regulatory Commission
Financial StatementsConsolidated Financial Statements
FTIP ActFederal Tax Increase Prevention Act
FTRFinancial transmission right
Fuel-relatedElectric production fuel and energy purchases
FWSU.S. Fish and Wildlife Service
GAAPU.S. generally accepted accounting principles
GHGGreenhouse gases
HAPHazardous air pollutants
HDDHeating degree days

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Abbreviation or AcronymDefinition
IBEWInternational Brotherhood of Electrical Workers
IPLInterstate Power and Light Company
IRSInternal Revenue Service
ITCITC Midwest LLC
IUBIowa Utilities Board
Jo-CarrollJo-Carroll Energy, Inc.
KEESAKey Executive Employment and Severance Agreement
KewauneeKewaunee Nuclear Power Plant
KWhKilowatt-hour
MACTMaximum achievable control technology
MarshalltownMarshalltown Generating Station
MATSMercury and Air Toxic Standard
MDAManagement’s Discussion and Analysis of Financial Condition and Results of Operations
CACertificate of authorityMGPManufactured gas plant
CAAClean Air ActMISOMidcontinent Independent System Operator, Inc.
MPUCCAIRMinnesota Public Utilities CommissionClean Air Interstate Rule
MVPMulti-value project
MWMegawatt
CCRCoal combustion residualsMWhMegawatt-hour
N.A.CDDNational AssociationCooling degree days
N/ANot applicable
CO2Carbon dioxideNAAQSNational Ambient Air Quality Standards
NBPLCorporate ServicesNorthern Border Pipeline Company
NeenahNeenahAlliant Energy FacilityCorporate Services, Inc.
Nelson DeweyNelson Dewey Generating Station
Note(s)Combined Notes to Consolidated Financial Statements
NGPLCPCNNatural Gas Pipeline Co.Certificate of AmericaPublic Convenience and Necessity
NNGNorthern Natural Gas Company
NO2Nitrogen dioxide
NOxNitrogen oxide
CRANDICCedar Rapids and Iowa City Railway CompanyOIPAlliant Energy 2010 Omnibus Incentive Plan
CSAPRCross-State Air Pollution RuleOPEBOther postretirement benefits
PJMCWIPPJM Interconnection, LLCConstruction work in progressPATH ActProtecting Americans from Tax Hikes Act
PMDAECParticulate matterDuane Arnold Energy Center
PPAPurchased power agreement
DATCDuke-American Transmission Company, LLCPSCWPublic Service Commission of Wisconsin
PSDDCPPrevention of Significant DeteriorationAlliant Energy Deferred Compensation Plan
RECRenewable energy credit
Receivables AgreementReceivables Purchase and Sale Agreement
DLIPAlliant Energy Director Long Term Incentive PlanRESRenewable energy standards
ResourcesDthAlliant Energy Resources, LLCDekatherm
RiversideRiverside Energy Center
EEPEnergy efficiency planRMTRMT, Inc.
RPSEGURenewable portfolio standardElectric generating unit
SCRSelective catalytic reduction
EPAU.S. Environmental Protection AgencySECSecurities and Exchange Commission
Sheboygan FallsEPBSheboygan Falls Energy FacilityEmissions plan and budget
SIPState implementation plan
SO2Sulfur dioxide
SRPEPSSupplemental Retirement PlanEarnings per weighted average common share
SSRSystem Support Resource
TBDTo be determined
U.S.United States of America
FERCFederal Energy Regulatory CommissionVEBAVoluntary Employees’ Beneficiary Association
Financial StatementsConsolidated Financial StatementsVIEVariable interest entity
VPFTRVice PresidentFinancial transmission right
WACCWeighted-average cost of capital
Fuel-relatedElectric production fuel and purchased powerWhiting PetroleumWhiting Petroleum Corporation
GAAPU.S. generally accepted accounting principlesWPLWisconsin Power and Light Company
GHGGreenhouse gasesWPL TranscoWPL Transco, LLC


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FORWARD-LOOKING STATEMENTS
Statements contained in this Annual Report on Form 10-K that are not of historical fact are forward-looking statements intended to qualify for the safe harbors from liability established by the Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified as such because the statements include words such as “may,” “believe,” “expect,” “anticipate,” “plan,” “project, “will,” “projections,” “estimate,” or other words of similar import. Similarly, statements that describe future financial performance or plans or strategies are forward-looking statements. Such forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Some, but not all, of the risks and uncertainties of Alliant Energy, IPL and WPL that could materially affect actual results include:

federal and state regulatory or governmental actions, including the impact of energy, tax (including potential tax reform), financial and health care legislation, and of regulatory agency orders;
IPL’s and WPL’s ability to obtain adequate and timely rate relief to allow for, among other things, the recovery of fuel costs, operating costs, transmission costs, environmental compliance and remediation costs, deferred expenditures, capital expenditures, and remaining costs related to EGUs that may be permanently closed, earning their authorized rates of return, and the payments to their parent of expected levels of dividends;
the ability to continue cost controls and operational efficiencies;
the impact of IPL’s pending retail electric base rate freezefiling, which is currently expected to be filed in Iowa during 2015 and 2016;
the impactsecond quarter of WPL’s retail electric and gas base rate freeze in Wisconsin during 2015 and 2016;2017;
weather effects on results of utility operations, including impacts of temperature changes in IPL’s and WPL’s service territories on customers’ demand for electricity and gas;operations;
the impact of the economy in IPL’s and WPL’s service territories and the resulting impacts on sales volumes, margins and the ability to collect unpaid bills;
the impact of customer- and third party-owned generation, including alternative electric suppliers, in IPL’s and WPL’s service territories on system reliability, operating expenses and customers’ demand for electricity;
the impact of energy efficiency, franchise retention customer- and third party-owned generation and customer disconnects on sales volumes and margins;
the impact that price changes may have on IPL’s and WPL’s customers’ demand for electric, gas and steam services and their ability to pay their bills;
developments that adversely impact the ability to implement the strategic plan, including unanticipated issues withplan;
the ability to qualify for the full level of production tax credits on planned and potential new emission controls equipment for various coal-fired EGUs of IPL and WPL, IPL’s construction of Marshalltown, WPL’s proposed Riverside expansion, various replacements and expansion of IPL’s and WPL’s natural gas distribution systems, Resources’ electricity output and selling price of such output from its Franklin County wind project, the potential decommissioning of certain EGUs of IPL and WPL,farms and the anticipated salesimpact of IPL’s electric and gas distribution assets in Minnesota;changes to production tax credits for wind farms;
issues related to the availability and operations of EGUs, including start-up risks, breakdown or failure of equipment, performance below expected or contracted levels of output or efficiency, operator error, employee safety, transmission constraints, compliance with mandatory reliability standards and risks related to recovery of resulting incremental costs through rates;
disruptions in the supply and delivery of coal, natural gas, purchased electricity and purchased electricity;coal;
changes in the price of delivered coal, natural gas, and purchased electricity and coal due to shifts in supply and demand caused by market conditions and regulations, and the abilityregulations;
impacts on equity income from unconsolidated investments due to recover andfurther potential changes to retain the recovery of related changes in purchased power, fuel and fuel-related costs through rates in a timely manner;
the impact that price changes may haveATC’s authorized return on IPL’s and WPL’s customers’ demand for electric, gas and steam services and their ability to pay their bills;equity;
issues associated with environmental remediation and environmental compliance, including compliance with the Consent Decree between WPL, the EPA and the Sierra Club, andthe Consent Decree between IPL, the EPA, the Sierra Club, the State of Iowa and Linn County in Iowa, the CCR rule, the Clean Power Plan, future changes in environmental laws and regulations, including the EPA’s recently issued proposed regulations for CO2 emissions reductions from new and existing fossil-fueled EGUs, and the final CCR rule, and litigation associated with environmental requirements;
the ability to defend against environmental claims brought by state and federal agencies, such as the EPA, state natural resources agencies or third parties, such as the Sierra Club, and the impact on operating expenses of defending and resolving such claims;
the ability to recover through rates all environmental compliance and remediation costs, including costs for projects put on hold due to uncertainty of future environmental laws and regulations;
impacts that storms or natural disasters in IPL’s and WPL’s service territories may have on their operations and recovery of and rate relief for, costs associated with restoration activities;
the direct or indirect effects resulting from terrorist incidents, including physical attacks and cyber attacks, or responses to such incidents;

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the impact of penalties or third-party claims related to, or in connection with, a failure to maintain the security of personally identifiable information, including associated costs to notify affected persons and to mitigate their information security concerns;
the direct or indirect effects resulting from breakdown or failure of equipment in the operation of natural gas distribution systems, such as leaks, explosions and mechanical problems, and compliance with natural gas transmission and distribution safety regulations, such as those that may beproposed rules issued by the Pipeline and Hazardous Materials Safety Administration;
risks associated with deployment and integration of a new customer billing and information system, expectedwhich was completed in 2015;2016;

impacts of IPL’s future tax benefits from Iowa rate-making practices, including deductions for repairs expenditures and allocation of mixed service costs, and recoverability of the associated regulatory assets from customers, when the differences reverse in future periods;
any material post-closing adjustments related to any past asset divestitures, including the salesales of IPL’s Minnesota electric and natural gas assets, RMT and Whiting Petroleum, which could result from, among other things, warranties, parental guarantees or litigation;
continued access to the capital markets on competitive terms and rates, and the actions of credit rating agencies;
inflation and interest rates;
changes to the creditworthiness of counterparties with which Alliant Energy, IPL and WPL have contractual arrangements, including participants in the energy markets and fuel suppliers and transporters;
issues related to electric transmission, including operating in Regional Transmission Organization energy and ancillary services markets, the impacts of potential future billing adjustments and cost allocation changes from Regional Transmission Organizations and recovery of costs incurred;
changes made by FERC to ATC’s authorized return on equity;
current or future litigation, regulatory investigations, proceedings or inquiries;
reputational damage from negative publicity, protests, fines, penalties and other negative consequences resulting in regulatory and/or legal actions;
Alliant Energy’s ability to sustain its dividend payout ratio goal;
employee workforce factors, including changes in key executives, collective bargaining agreements and negotiations, work stoppages or restructurings;
inability to access technological developments, including those related to technological developments;wind turbines, solar generation, smart technology, battery storage and other future technologies;
changes in technology that alter the channels through which electric customers buy or utilize power;electricity;
material changes in retirementemployee-related benefit and benefit plancompensation costs;
the impact of performance-based compensation plans accruals;
the effect of accounting pronouncementsstandards issued periodically by standard-setting bodies, including a new revenue recognition standard, which is currently expected to be adopted in 2017;
the impact of changes to production tax credits for wind projects;bodies;
the impact of adjustments made to deferred tax assets and liabilities from state apportionment assumptions;
the ability to utilize tax credits and net operating losses generated to date, and those that may be generated in the future, before they expire;
impacts of the extension of bonus depreciation deductions;
the ability to successfully complete tax audits and changes in tax accounting methods including changes required by new tangible property regulations with no material impact on earnings and cash flows; and
factors listed in MDA and Item 1A Risk Factors.

Alliant Energy, IPL and WPL each assume no obligation, and disclaim any duty, to update the forward-looking statements in this Annual Report on Form 10-K, except as required by law.

WEBSITE ACCESS TO REPORTS
Alliant Energy, IPL and WPL make their periodic and current reports, and amendments to those reports, available, free of charge, on Alliant Energy’s website at www.alliantenergy.com/investors on the same day as such material is electronically filed with, or furnished to, the SEC. Alliant Energy, IPL and WPL are not including the information contained on Alliant Energy’s website as a part of, or incorporating it by reference into, this Annual Report on Form 10-K, except as required by law.10-K.


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PART I

This Annual Report on Form 10-K includes information relating to Alliant Energy, IPL and WPL (as well as ResourcesAEF and Corporate Services). Where appropriate, information relating to a specific entity has been segregated and labeled as such. Unless otherwise noted, the information herein excludes discontinued operations for all periods presented.

ITEM 1. BUSINESS

A. GENERAL
Alliant Energy was incorporated in Wisconsin in 1981 and maintains its principal executive offices in Madison, Wisconsin. Alliant Energy operates as a regulated investor-owned public utility holding company. Alliant Energy’s primary focus is to provide regulated electric and natural gas service to approximately 1 million960,000 electric and approximately 420,000410,000 natural gas customers in the Midwest through its two public utility subsidiaries, IPL and WPL. The primary first tier wholly-owned subsidiaries of Alliant Energy are: IPL, WPL, Resources and Corporate Services. A brief description of the primary first tier subsidiaries of Alliant Energy isare as follows:

1) IPL - was incorporated in 1925 in Iowa as Iowa Railway and Light Corporation. IPL is a public utility engaged principally in the generation and distribution of electricity and the distribution and transportation of natural gas to retail customers in select markets in Iowa and southern Minnesota. In Iowa,Iowa. IPL provides utility services to incorporated communities as directed by the IUB and utilizes non-exclusive franchises, which cover the use of public right-of-ways for utility facilities in incorporated communities for a maximum term of 25 years. At December 31, 20142016, IPL supplied electric and natural gas service to

approximately 529,000490,000 and 235,000220,000 retail customers, respectively.respectively, in Iowa. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa. IPL is also engaged in the generation and distribution of steam for two customers in Cedar Rapids, Iowa. In 20142016, 20132015 and 20122014, IPL had no single customer for which electric, gas, steam and/or other sales accounted for 10% or more of IPL’s consolidated revenues. Refer to Note 3 for discussion of IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets.

2) WPL - was incorporated in 1917 in Wisconsin as Eastern Wisconsin Electric Company. WPL is a public utility engaged principally in the generation and distribution of electricity and the distribution and transportation of natural gas to retail customers in select markets in southern and central Wisconsin. WPL operates in municipalities pursuant to permits of indefinite duration and state statutes authorizing utility operation in areas annexed by a municipality. At December 31, 2014,2016, WPL supplied electric and natural gas service to approximately 463,000470,000 and 185,000190,000 retail customers, respectively. WPL also sells electricity to wholesale customers in Wisconsin. In 2014, 20132016, 2015 and 2012,2014, WPL had no single customer for which electric, gas and/or other sales accounted for 10% or more of WPL’s consolidated revenues. WPL’s consolidated subsidiary, WPL Transco, holdsheld Alliant Energy’s investment in ATC.ATC until December 31, 2016. Refer to Note 6(a) for further discussion of ATC.WPL’s transfer of its investment in ATC to ATI on December 31, 2016.

3) RESOURCESAEF - was incorporatedcreated in 19882016 in Wisconsin. In 2008, Resources was converted toWisconsin as a limited liability company. Alliant Energy’s non-regulated investments are organized under Resources.AEF. Refer to “Information Relating to Non-regulated Operations” for additional details.

4) CORPORATE SERVICES - was incorporated in 1997 in Iowa. Corporate Services provides administrative services to Alliant Energy, IPL, WPL and Resources.AEF.

Refer to Note 17 for further discussion of business segments, which information is incorporated herein by reference.

B. INFORMATION RELATING TO ALLIANT ENERGY ON A CONSOLIDATED BASIS

1) EMPLOYEES - At December 31, 2014,2016, Alliant Energy’s consolidated subsidiariesEnergy, IPL and WPL had the following full- and part-time employees:
Number of Number of Total Percentage of EmployeesTotal Number of Percentage of Employees
Bargaining Unit Other Number of Covered by CollectiveNumber of Bargaining Unit Covered by Collective
Employees Employees Employees Bargaining AgreementsEmployees Employees Bargaining Agreements
Alliant Energy3,978 2,244 56%
IPL1,143
 623
 1,766
 65%1,679 1,095 65%
WPL1,128
 263
 1,391
 81%1,286 1,044 81%
Corporate Services24
 915
 939
 3%
Resources88
 28
 116
 76%
2,383
 1,829
 4,212
 57%


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TableThe majority of ContentsIPL’s bargaining unit employees are covered by the International Brotherhood of Electrical Workers Local 204 (Cedar Rapids) collective bargaining agreement, which expires on August 31, 2017. All of WPL’s bargaining unit employees are covered by the International Brotherhood of Electrical Workers Local 965 collective bargaining agreement, which expires on May 31, 2019.


At December 31, 2014, Alliant Energy employees covered by collective bargaining agreements were as follows:
Number ofContract
EmployeesExpiration Date
IPL:
IBEW Local 204 (Cedar Rapids)770
8/31/17
IBEW - Various373
Various
1,143
WPL - IBEW Local 9651,128
5/31/19
Resources - Various88
Various
Corporate Services - IBEW Local 20424
10/31/16
2,383

2) CAPITAL EXPENDITURE AND INVESTMENT PLANS - Refer to “Liquidity and Capital Resources” in MDA for discussion of anticipated construction and acquisition expenditures for 20152017 through 20182020.

3) REGULATION - Alliant Energy, IPL and WPL are subject to regulation by various federal, state and local agencies. The following includes the primary regulations impacting Alliant Energy’s, IPL’s and WPL’s businesses.

FERC -
Public Utility Holding Company Act of 2005 - Alliant Energy is registered with FERC as a public utility holding company, pursuant to the Public Utility Holding Company Act of 2005, and is required to maintain certain records and to report certain transactions involving its public utilities, service company and other entities regulated by FERC. Corporate Services, IPL and WPL are subject to regulation by FERC under the Public Utility Holding Company Act of 2005 for various matters including, but not limited to, affiliate transactions, public utility mergers, acquisitions and dispositions, and books, records and accounting requirements.

Energy Policy Act - The Energy Policy Act requires creation of an Electric Reliability Organization to provide oversight by FERC. FERC designated North American Electric Reliability Corporation as the overarching Electric Reliability Organization. Midwest Reliability Organization, which is a regional member of North American Electric Reliability Corporation, has direct responsibility for mandatory electric reliability standards for IPL and WPL.


Federal Power Act - FERC also has jurisdiction, under the Federal Power Act, over certain electric utility facilities and operations, electric wholesale and transmission rates, dividend payments, issuance of IPL’s securities, and accounting practices of Corporate Services, IPL and WPL.

Electric Wholesale Rates - IPL and WPL have receivedreceive wholesale electric market-based rate authority from FERC. Market-based rate authorization allows for wholesale sales of electricity within the MISO and PJM marketsmarket and in transactions directly with third parties, based on the market value of the transactions. IPL and WPL also have FERC-approved cost-of-servicecost of service formula based rates related to the provision of firm full- and partial-requirement wholesale electric sales. Both IPL’s and WPL’s wholesale cost-of-service tariffs are formula-based tariffs thatsales, which allow for true-ups to actual costs, including fuel costs.

Electric Transmission Rates - FERC regulates the rates charged for electric transmission facilities used in interstate commerce. Neither IPL nor WPL own or operate electric transmission facilities; however, both IPL and WPL pay for the use of the interstate electric transmission system based upon FERC-regulated rates. IPL and WPL rely primarily on the use of the ITC and ATC transmission systems, respectively. Due to the formula rates used by ITC and ATC to charge their customers and possible future changes to these rates, there is uncertainty regarding IPL’s and WPL’s future electric transmission service expense. Refer to “Other Future Considerations” in MDA for further discussion of electric transmission service expense.

Natural Gas Act - FERC regulates the transportation and sale for resale of natural gas in interstate commerce under the Natural Gas Act. Under the Natural Gas Act, FERC has authority over certain natural gas facilities and operations of IPL and WPL.

IUB - IPL is subject to regulation by the IUB related to its operations in Iowa for various matters including, but not limited to, retail utility rates and standards of service, accounting requirements, sales of assets with values that exceed 3% of IPL’s revenues, for its Iowa jurisdiction, and approval of the location and construction of EGUs.


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Table of Contents


Retail Utility Base Rates - IPL files periodic requests with the IUB for retail rate changes. These filingschanges, which are based on historical test periods. The historical test periods may be adjusted for certain known and measurable changes to capital investments, cost of capital and operating and maintenance expenses consistent with IUB rules and regulations. Interim retail rates can be placed in effect 10 days after the rate application filing, subject to refund, and must be based on past precedent.previously established regulatory principles. The IUB must decide on requests for retail rate changes within 10 months of the date of the application for which changes are filed, or the interim rates granted become permanent.

Retail Commodity Cost Recovery Mechanisms - Refer to Note 1(g) for discussion of IPL’s retail electric and natural gas tariffs, which contain automatic adjustment clauses for changes in prudently incurred commodity costs required to serve its retail customers in Iowa. Any over- or under-collection of commodity costs for each given month are automatically reflected in future billings to retail customers.

Retail Electric Transmission Cost Recovery Mechanism - ElectricRefer to Note 1(g) for discussion of a transmission cost recovery rider utilized by IPL for recovery of its electric transmission service expense is billed to IPL’s Iowafrom its retail electric customers through a transmission cost rider. This cost recovery mechanism provides for subsequent adjustments to electric rates charged to Iowa retail electric customers for changes in electric transmission service expense. Changes in the under-/over-collection of these costs are reflected in future billings to customers. The transmission cost rider will remain in effect until the IUB’s final decision in IPL’s next retail electric base rate case, at which time the rider will continue in its current form, continue in a modified form or be terminated.

Energy Efficiency Cost Recovery Mechanism - In accordance with Iowa law, IPL is required to file an EEP every five years with the IUB. An EEP provides a utility’s plan and related budget to achieve specified levels of electric and gas energy savings. IUB approval demonstrates that the IUB believes that IPL’s EEP is reasonably expected to achieve cost-effective delivery of the energy efficiency programs. ToRefer to Note 1(g) for discussion of the extent approved by the IUB, costs associated with executing the EEP are recovered from ratepayers through an additional tariff called an EECR factor. The EECR factors are revised annually and include a reconciliation to eliminate any over- or under-recoveryrecovery of IPL’s energy efficiency expensecosts from prior periods.its retail electric and gas customers.

Electric Generating Units - IPL must obtain a certificate of public convenience, use and necessity (GCU Certificate) from the IUB in order to construct a new, or significantly alter (including fuel switching) an existing, EGU located in Iowa with 25 MW or more of capacity. IPL’s ownership and operation of EGUs (including those located outside the state of Iowa) to serve Iowa customers is subject to retail utility rate regulation by the IUB.

Gas DistributionPipeline Projects - IPL must obtain a pipeline permit from the IUB related to the citingsiting of certain utility gas pipelines in Iowa.Iowa that will be operated at a pressure over 150 pounds per square inch and will transport gas from a gathering or storage facility to a distribution system or single, large volume customer.

Advance Rate-making Principles - Iowa law provides Iowa utilities with rate-making principles prior to making certain generation investments in Iowa. As a result, IPL may file for, and the IUB must render a decision on, rate-making principles for EGUs located in Iowa, including any new combined-cycle natural gas-fired EGU, any renewable generating resource such as a wind facility, and base-load (nuclear or coal-fired generation) EGUs with a nameplate generating capacity of 300

MW or more, combined-cycle natural gas-fired EGUs and renewable generating resources, such as wind facilities.more. Upon approval of rate-making principles by the IUB, IPL must either build the EGU under the approved rate-making principles, or not at all.

Electric Generating Unit EmissionEnvironmental Controls Projects - IPL is required to submit an updated EPB biennially to the IUB setting out a multi-year plan and budget for managing regulated emissions from its coal-fired EGUs in a cost-effective manner. IPL must simultaneously submit this plan and budget to the Iowa DNRDepartment of Natural Resources for a determination of whether the plan and budget meet state environmental requirements for regulated emissions. The reasonable costs associated with implementing the approved plan are expected to be included in IPL’s future retail electric rates.

PSCW - Alliant Energy is subject to regulation by the PSCW for the type and amount of Alliant Energy’s investments in non-utility businesses and other affiliated interest activities, among other matters. WPL is also subject to regulation by the PSCW related to its operations in Wisconsin for various matters including, but not limited to, retail utility rates and standards of service, accounting requirements, issuance and use of proceeds of securities, affiliate transactions, approval of the location and construction of EGUs and certain other additions and extensions to facilities.

Retail Utility Base Rates - WPL files periodic requests with the PSCW for retail rate changes. These filings are required to be based on forward-looking test periods. There is no statutory time limit for the PSCW to decide retail base rate requests. However, the PSCW attempts to process retail base rate cases in approximately 10 months and has the ability to approve interim retail rate relief, subject to refund, if necessary. Currently, WPL is required to defer a portion of its earnings if its annual regulatory return on common equity exceeds certain levels and is allowed to request a change in retail base rates if its annual return on common equity falls below a certain level.

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Retail Commodity Cost Recovery Mechanisms -
Electric - WPL’s retail electric base rates include estimates of annual fuel-related costs anticipated during the forward-looking test period. During each retail electric rate proceeding, or in a separate fuel cost plan approval proceeding, the PSCW sets fuel monitoring ranges based on the forecasted fuel-related costs used to determine rates in such proceeding. If WPL’s actual fuel-related costs fall outside these fuel monitoring ranges, WPL is authorized to defer the incremental over- or under-collection of fuel-related costs from retail electric customers that are outside the approved ranges. Deferrals of under-collections are reduced to the extent actual return on common equity earned by WPL during the fuel cost plan year exceeds the applicable authorized return on common equity. Subject to review and approval by the PSCW, any deferred over- or under-collection of fuel-related costs for each year are reflected in future billings to retail customers.

Natural Gas - WPL’s retail natural gas tariffs contain an automatic adjustment clause for changes in prudently incurred natural gas costs required to serve its retail gas customers. Any over- or under-collectionRefer to Note 1(g) for discussion of naturalthe recovery of these costs from WPL’s retail electric and gas costs for each given month are automatically reflected in future billings to retail customers.

Retail Electric Transmission Cost Recovery - WPL’s retail electric base rates include estimates of electric transmission service expense anticipated during the forward-looking test period. A majorityRefer to Note 1(g) for discussion of the recovery of WPL’s electric transmission service expense in 2015 and 2016 will be subject to a reconciliation of such estimated amounts to actual costs incurred with any difference deferred for inclusion in future base rate changes.from its retail electric customers.

Energy Efficiency Cost Recovery - WPL contributes a certain percentage1.2% of its annual retail utility revenues to help fund Focus on Energy, Wisconsin’s state-wide energy efficiency and renewable energy resource program. Estimated contributionsRefer to Focus on Energy, along with WPL-runNote 1(g) for discussion of the recovery of WPL’s energy efficiency program costs are recovered from WPL’sits retail customers through changes in base rates determined during periodic rate proceedingselectric and include a reconciliation of such estimated amounts to actual costs incurred with any difference deferred for inclusion in a future base rate proceeding.gas customers.

New Electric Generating Units - A CA application is required to be filed with the PSCW for construction approval of any new EGU with a capacity of less than 100 MW and a project cost of $10$10.7 million or more. WPL must obtain a CPCN from the PSCW in order to construct a new EGU in Wisconsin with a capacity of 100 MW or more. In addition, WPL’s ownership and operation of EGUs (including those located outside the state of Wisconsin) to serve Wisconsin customers is subject to retail utility rate regulation by the PSCW.

Electric Generating Unit Upgrades -and Electric Distribution Projects- A CA application is required to be filed with the PSCW for construction approval of any additions to EGUs, including emissionenvironmental controls projects. The current PSCW rules require a CA application for suchprojects, as well as electric distribution projects, with an estimated project costcosts of $10$10.7 million or more.

Gas Distribution Projects - A CA application is required to be filed with the PSCW for construction approval of gas projects with an estimated project cost of $2.5 million or more and at any time that WPL requests to extend gas service to a new portion of its service territory.

Advance Rate-making Principles - Wisconsin law provides Wisconsin utilities with the opportunity to request rate-making principles prior to the purchase or construction of any nuclear or fossil-fueled EGU or renewable generating resource, such as a wind facility, utilized to serve Wisconsin customers. WPL is not obligated to file for or accept authorized rate-making principles under Wisconsin law. WPL can proceed with an approved project under traditional rate-making terms or accept authorized rate-making principles under Wisconsin law.

MPUC - IPL is subject to regulation by the MPUC related to its operations in Minnesota for various matters including, but not limited to, retail utility rates and standards of service, accounting requirements, affiliate transactions, and approval of the location and construction of EGUs located in Minnesota with a capacity in excess of 50 MW.

Retail Utility Rates - Requests for retail rate change can be based on either historical or projected data and interim retail rates can be implemented 60 days after the filing date, with regulatory review. IPL has historically requested retail rate relief based on historical test periods. The historical test periods may be adjusted for certain known and measurable capital additions placed in service by IPL and operating and maintenance expenses incurred by IPL within 12 months after the end of the test year. Unless otherwise ordered, the MPUC must reach a final decision within 10 months of filing for retail rate relief; however, the MPUC can extend the timing by 90 days.


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Renewable Energy Cost Recovery Mechanism - In 2011, IPL received an order from the MPUC approving the implementation of an automatic cost recovery rider on a temporary basis to recover costs associated with renewable generation. The renewable energy rider does not require a base rate case for annual revision of rates charged to IPL’s Minnesota retail electric customers, but requires that the renewable energy costs incurred be fully reconciled against the revenues collected for such costs. IPL currently utilizes this mechanism to recover costs associated with its Whispering Willow - East wind project located in Iowa and production tax credits.

Refer to Note 3 for discussion of IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets.

Environmental - Extensive environmental laws and regulations are applicable as a result of current and past operations. The environmental laws and regulations relate to the protection of the environment and health and safety matters, including those governing air emissions; water discharges; protection of habitat for potentially threatened and endangered species; the

management, storage and disposal of hazardous materials; and the clean-up of contaminated sites, including former MGP sites.

The EPA administers certain federal regulatory programs and has delegated the administration of other environmental regulatory programs to the applicable state environmental agencies. In general, the stateState agencies generally have jurisdiction over air and water quality, hazardous substances management, transportation and clean-up, and solid waste management requirements. In certain cases, the state environmental agencies have delegated the administration of environmental programs to local agencies.

Federal, state and local permits are regularly obtained to assure compliance with environmental laws and regulations. Costs associated with such compliance have increased in recent years and are expected to continue to increase in the future. Prudently incurred compliance and remediation costs for IPL and WPL are anticipated to be recoverable, in whole or part, through future rate case proceedings. Refer to “Environmental Matters” in MDA and Note 16(e) for further discussion of electric and gas environmental matters, including current or proposed environmental regulations. Refer to “Strategic Overview - Environmental Compliance Plans” in MDA for details of future environmental compliance plans to adhere to applicable environmental requirements.

Refer to Notes 1(b), 1(g), 2 and 16(e) and “Rate Matters” and “Environmental Matters” in MDA for additional information regarding regulation and utility rate matters.

4) STRATEGIC OVERVIEW - Refer to “Strategic Overview” in MDA for discussion of various strategic actions by Alliant Energy, IPL and WPL.

C. INFORMATION RELATING TO UTILITY OPERATIONS
Alliant Energy’s utility business (IPL and WPL) has three segments: a) electric operations; b) gas operations; and c) other, which includes IPL’s steam operations and the unallocated portions of the utility business. In 2014, IPL’s and WPL’s operating revenues and operating income (loss)as a percentage of total revenues for these three utility business segments were as follows:
 IPL WPL
 Operating Operating Operating Operating
 Revenues Income Revenues Income
Electric81% 80% 84% 92%
Gas16% 12% 15% 9%
Other3% 8% 1% (1%)
 100% 100% 100% 100%
IPLWPL

1) ELECTRIC UTILITY OPERATIONS
General - Electric utility operations represent the largest operating segment for Alliant Energy, IPL and WPL. Alliant Energy’s electric utility operations are located in the Midwest with IPL providing retail electric service in Iowa and southern MinnesotaWPL providing retail and WPL providingwholesale electric service in southernWisconsin. IPL also sells electricity to wholesale customers in Minnesota, Illinois and central Wisconsin. In September 2013, IPL signed a definitive agreement to sell its Minnesota electric distribution assets. Refer to Note 3 for discussion of this anticipated sale.Iowa. Refer to the “Electric Operating Information” tables for additional details regarding electric utility operations.


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Jurisdictions - Electric utility revenues by state were as follows (dollars in millions):
 2014 2013 2012
 Amount Percent Amount Percent Amount Percent
IPL:           
Iowa
$1,415.0
 52% 
$1,416.3
 52% 
$1,295.5
 50%
Minnesota78.3
 3% 75.5
 3% 75.6
 3%
Subtotal1,493.3
 55% 1,491.8
 55% 1,371.1
 53%
WPL:           
Wisconsin1,220.3
 45% 1,197.2
 45% 1,218.2
 47%
 
$2,713.6
 100% 
$2,689.0
 100% 
$2,589.3
 100%

The percentage of regulated electric utility revenues were as follows:
 IPL WPL
 2014 2013 2012 2014 2013 2012
IUB93% 93% 92% % % %
PSCW% % % 86% 85% 86%
MPUC5% 5% 5% % % %
FERC2% 2% 3% 14% 15% 14%
 100% 100% 100% 100% 100% 100%

Customers - The number of electric customers and communities served at December 31, 2014 was as follows:
 Retail Customers Wholesale Other Total Communities
 Iowa Minnesota Wisconsin Total Customers Customers Customers Served
IPL486,854
 42,338
 
 529,192
 7
 1,378
 530,577
 752
WPL
 
 463,139
 463,139
 21
 2,256
 465,416
 607
 486,854
 42,338
 463,139
 992,331
 28
 3,634
 995,993
 1,359

IPL and WPL provide electric utility service to a diversified base of retail customers in several industries, with the largest concentrations in the food and industrial manufacturing, chemical (including ethanol) and paper industries. IPL’s retailIPL and WPL also sell electricity to wholesale customers, in the above table are billed under base rates established by the IUB or MPUC that include recovery of and a return on investments in electric infrastructure and recovery of purchased electric capacity costs and other costs required to serve customers. Electric transmission service expense is billed to IPL’s Iowa retail electric customers through a transmission cost rider. This cost recovery mechanism provides for subsequent adjustments to electric rates charged to Iowa electric retail customers for changes in electric transmission service expense. IPL’s fuel-related costs are recovered pursuant to fuel adjustment clauses. WPL’s retail customers in the above table are billed under base rates established by the PSCW that include recovery of and a return on investments in electric infrastructure and recovery of fuel-related costs, purchased electric capacity costs, electric transmission service costs and other costs required to serve customers. WPL defers fuel-related costs that exceed or fall below established fuel monitoring ranges through an electric fuel cost recovery mechanism. Deferrals of under-collections are reduced to the extent actual return on common equity earned by WPL during the fuel cost plan year exceeds the applicable authorized return on common equity. Refer to “Rate Matters” in MDA for details of IPL’s settlement agreement approved by the IUB in September 2014 and WPL’s retail electric and gas base rate case approved by the PSCW in July 2014. Refer to Note 2 for additional discussion of utility rate cases.

Wholesale customers in the above table, which primarily consist of municipalities and rural electric cooperatives, are billed undercooperatives. Refer to “Strategic Overview” in MDA for discussion of recent agreements with certain of WPL’s electric wholesale service agreements. These agreements include standardized pricing mechanisms that are detailed in tariffs approved by FERC through wholesale rate case proceedings. The tariffs include an annual true-up process for actual costs incurred. A majority of IPL’s andcustomers related to WPL’s wholesale service agreements have terms that end after 2016.Riverside expansion. Refer to “Other Future Considerations” in MDA for discussion of notifications provided to each of IPL and WPL to terminate certain of their wholesale power supply agreements. Refer to Note 3 for discussion of IPL’s Minnesota electric distribution asset sales agreement, which includes a wholesale power supply agreement that is subject to FERC approval.

In addition, WPL has bulk power customers, included in “Other customers” in the above table, that are billed according to negotiated, long-term customer-specific contracts, pursuant to FERC-approved tariffs.


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Seasonality - Electric sales are seasonal to some extent with the annual peak normally occurring in the summer months due to air conditioning requirements. Electric sales are also impacted to a certain extent in the winter months due to heating requirements. In 2014,Refer to the Electric Operating Information” tables for additional details regarding maximum summer and winter peak hour demands were as follows:demands.
 Summer Peak Winter Peak
 MW Date MW Date
Alliant Energy5,426 July 22 4,803 January 6
IPL2,840 September 4 2,601 January 6
WPL2,594 July 22 2,202 January 6

Competition - Retail electric customers in Iowa Wisconsin and MinnesotaWisconsin currently do not have the ability to choose their electric supplier, and IPL and WPL have obligations to serve all their retail electric customers. Although electric service in Iowa Wisconsin and MinnesotaWisconsin is regulated, IPL and WPL still face competition from self-generation by large industrial customers, customer- and third party-owned generation (e.g. rooftop solar panels), alternative energy sources, and petitions to municipalize (Iowa) as well as

service territory expansions by municipal utilities through annexations (Wisconsin). However, IPLIn addition, IPL’s and WPL attemptWPL’s wholesale customers may choose to purchase their electric energy and capacity needs from the MISO market, independent power producers or other utilities. Alliant Energy’s strategic plan includes actions to retain current customers and attract new customers into theirIPL’s and WPL’s service territories in an effort to keep energy rates low for all itsof their customers. Refer to “Strategic Overview” in MDA for discussion of the growth element of the strategic plan, which includes accelerating the growth of customers’ electric usage.

Renewable Energy Standards - As discussed in greater detail below, the states in which IPLIowa and WPL operateWisconsin have RES, which establish the minimum amount of energy electric utilities or service providersIPL and WPL must supply from renewable resources.

IPL - IPL has requirements to comply with RES in both Iowa and Minnesota and primarily relies upon RECsrenewable energy generated from the wind projects it owns and renewable energy acquired under PPAs to meet suchthese requirements. IPL allocates its portfolio of RECs between its Iowa and Minnesota jurisdictions based on a load-ratio share. IPL has excess RECs in Iowa and a shortfall of RECs in Minnesota. However, the excess RECs in Iowa are much larger than the Minnesota shortfall partially due to the relatively small amount of IPL’s load served in Minnesota compared to Iowa. IPL is permitted to use its surplus of RECs in Iowa to meet its deficit of RECs in Minnesota. IPL expects to meet both its Iowa and Minnesota renewable energy requirements on a system-wide basis without the need to purchase additional RECs.

Iowa - IPL is required to purchase or own 49.8 MW of nameplate capacity from alternate energy or small hydro facilities located in its service area. IPL currently exceeds this Iowa requirement.

Minnesota - IPL’s total Minnesota retail electric sales supplied with renewable energy sources must be at least 12% currently and 17% by 2016, 20% by 2020, and 25% by 2025. Utilities in Minnesota may meet the requirements of the RES with renewable energy generated by the utility, renewable energy acquired under PPAs, or the use of accumulated or acquired RECs. IPL has met the 12% requirement and currently expects to satisfy future Minnesota RES requirements with its current wind generation and wind PPAs, supplemented as needed by acquiring additional RECs from its anticipated Iowa excess supply.

In addition to the above Minnesota requirement, IPL’s total Minnesota retail electric sales supplied with solar power must be at least 1.5% by 2020. IPL currently estimates that approximately 10 MW of solar power would be needed for compliance with this requirement by 2020.

WPL - The Wisconsin RES requires WPL to increase the portion of its total Wisconsin retail electric sales supplied by renewable energy sources above a benchmark of average retail sales from renewables in 2001, 2002 and 2003. The RES required a 2% increase above the benchmark by 2010 and will require a 6% increase above the benchmark by 2015. Based on this RES, WPL was required to supply a minimum of 5.28% of its total Wisconsin retail electric sales with renewable energy sources by 2010 and will be required to increase this amount to 9.28% by 2015. WPL may reach the RES with renewable energy it generates, it acquires under PPAs or through the use of renewable resource credits. WPL has met the 2010 requirements of this RES and currently expects to meet the 2015 requirements of the RES withutilizes its current renewable portfolio, which primarily consists of wind and hydro.hydro, to meet these requirements. IPL and WPL currently meet or exceed their respective RES requirements.

Energy Efficiency Programs -IPL and WPL continue to promote energy efficiency, including their customers’ ability to efficiently manage their energy use. Refer to “Strategic Overview” in MDA for discussion of Several energy efficiency programs at and initiatives help customers reduce their energy usage and related costs through the use of new energy efficient equipment, products and practices. The following are current key energy efficiency programs:

IPL EEP - In 2013, IPL received an order from the IUB approving IPL’s EEP for 2014 through 2018. The EEP includes IPL spending approximately $400 million for electric and WPL.natural gas energy efficiency programs in Iowa from 2014 through 2018, and is expected to conserve electric and natural gas usage equal to that of more than 100,000 homes.

Focus on Energy Program - In 2016, WPL contributed 1.2% of its annual retail utility revenues to help fund Focus on Energy, Wisconsin’s state-wide energy efficiency and renewable energy resource program.

Electric Supply - Alliant Energy, IPL and WPL have met, historical customer demand of electricity and expect to continue meeting, futurecustomer demand of electricity through a mix of electric supply including internally generated electricity,owned EGUs, PPAs and additional

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purchases from wholesale energy markets. Alliant Energy’s mix of electric supply has changed with WPL’s purchases of Wisconsin Electric Power Company’s 25% interest in Edgewater Unit 5 in 2011 and Riverside in 2012, the completion of wind projects including WPL’s Bent Tree wind project in 2011, the expiration of WPL’s Kewaunee PPA in December 2013, IPL’s DAEC PPA for a term from February 22, 2014 through December 31, 2025, WPL’s 150 MW PPA for a term from January 1, 2014 through December 31, 2018 and IPL’s retirement of various EGUs. Alliant Energy expects its mix of electric supply to change further in the next several years with IPL’s construction of Marshalltown, WPL’s proposed construction of the Riverside expansion, IPL’s approved 500 MW of additional wind generation and the proposed retirement of additionalvarious EGUs. Generation plans are periodically updated to identify longer term electric supply resource needs. These long-termLong-term generation plans are intended to meet customer demand, reduce carbon emissions, reduce reliance on PPAs and wholesale market purchases and mitigate the impacts of future EGU retirements while maintaining compliance with long-term electric demand planning reserve margins, environmental requirements and RES established by regulators. Alliant Energy, IPL and WPL currently expect to meet utility customer demand in the future. However, unanticipated regional or local reliability issues could still arise in the event of outages or unexpected delays in the construction of new generating and/or transmission facilities, retirement of EGUs, EGU outages, transmission system outages or extended periods of extreme weather conditions. Refer to the “Electric Operating Information” tables for a profile of the sources of electric supply used to meet customer demand from 20102014 to 20142016. Refer to “Strategic Overview” in MDA for details of future generation plans.

Sources of Electric Energy - In 2016, sources of electric energy were approximately as follows:
Electric Demand Planning Reserve Margin - IPL and WPL are required to maintain a planning reserve margin above their load at the time of the MISO-wide peak to ensure reliability of electric service to their customers. The required installed capacity reserve margin is 14.3%15.8% and the required unforced capacity reserve margin is 7.1%7.8% for the June 1, 20152017 through May 31, 20162018 MISO planning year. IPL and WPL currently have adequate capacity to meet thesuch MISO planning reserve margin requirements for the June 1, 2015 through May 31, 2016 MISO planning year.requirements.


Generation - IPL and WPL own a portfolio of EGUs located in Iowa, Wisconsin and Minnesota with a diversified fuel mix including coal, natural gas, renewable resources and renewable resources.coal. Refer to “Properties” in Item 2 for details of IPL’s and WPL’s EGUs. Refer to

Nameplate CapacityNote 1(g) - The nameplate capacityfor discussion of IPL’s and WPL’s EGUs by primary fuel type is as follows:rate recovery of fuel-related costs and
 IPL WPL Total
 MWs % MWs % MWs %
Coal1,641
 51% 1,463
 46% 3,104
 48%
Natural gas1,031
 32% 1,448
 45% 2,479
 39%
Oil347
 11% 
 % 347
 5%
Wind200
 6% 269
 8% 469
 7%
Hydro
 % 41
 1% 41
 1%
Total3,219
 100% 3,221
 100% 6,440
 100%
Note 16(b) for details on IPL’s and WPL’s natural gas, coal and purchased power commitments.

Fuel Costs - The average cost of delivered fuel per million British Thermal Units used for electric generation was as follows:
IPL WPLIPL WPL
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
All fuels
$2.50
 
$2.36
 
$2.26
 
$2.82
 
$2.52
 
$2.26

$2.17
 
$2.21
 
$2.50
 
$2.61
 
$2.67
 
$2.82
Natural gas (a)2.86
 3.37
 6.05
 3.25
 3.68
 5.51
Coal2.05
 1.99
 1.91
 2.22
 2.21
 2.21
1.98
 1.94
 2.05
 2.47
 2.49
 2.22
Natural gas (a)6.05
 4.63
 3.79
 5.51
 4.86
 3.21

(a)The average cost of natural gas includes commodity and transportation costs as well as realized gains and losses from swap and option contracts used to hedge the price of natural gas volumes expected to be used by IPL’s and WPL’s natural gas-fired EGUs.

Natural Gas - As discussed in “Properties” in Item 2, Alliant Energy, IPL and WPL own several natural gas-fired EGUs. WPL also has exclusive rights to the output of AEF’s Sheboygan Falls facility under an affiliated lease agreement. These facilities help meet customer demand for electricity generally during peak hour demands and when natural gas prices are low enough to make natural gas-fired generation economical compared to other fuel sources, such as occurred in 2016 and 2015. Alliant Energy manages the gas supply to these gas-fired EGUs and helps ensure an adequate supply is available at known prices through a combination of gas commodity, pipeline transportation and storage agreements held by IPL and WPL for 2017 through 2028. Alliant Energy, IPL and WPL believe they are reasonably insulated against gas price volatility for these EGUs given their use of forward contracts and hedging practices, as well as their regulatory cost-recovery mechanisms. Refer to “Strategic Overview” in MDA for discussion of IPL’s construction of Marshalltown and WPL’s construction of the Riverside expansion, both of which are natural gas-fired combined-cycle EGUs.

Wind - As discussed in “Properties” in Item 2, IPL owns the Whispering Willow - East wind farm and WPL owns the Cedar Ridge and Bent Tree wind farms. All or some of the renewable energy attributes associated with generation from these sources may be used in future years to comply with RES or other regulatory requirements, or sold to third parties in the form of renewable energy credits or other environmental commodities. Refer to “Strategic Overview” in MDA for discussion of IPL’s and WPL’s planned and potential addition of wind generation to Alliant Energy’s resources portfolio.

Coal - Coal is a primaryone of the fuel sourcesources for internally generated electric supply and represented approximately 45%, 43% and 47% of Alliant Energy’s, IPL’s and WPL’s total sources of electric energy in 2014, respectively. Alliant Energy, through Corporate Services as agent for IPL and WPL, hasowned EGUs. Coal contracts entered into contracts with different suppliers to help ensure that a specified supply of coal is available, and delivered, at known prices for IPL’s and WPL’s coal-fired EGUs for 20152017 through 2018. As of December 31, 2014, existing contracts provide for a portfolio of coal supplies that cover approximately 72%, 65%, 31% and 21% of IPL’s and WPL’s estimated aggregate annual coal supply needs for 2015 through 2018, respectively.2019. Alliant Energy, IPL and WPL believe thistheir coal supply portfolio of coal supplies represents a reasonable balance between the risks of insufficient supplies and those associated with being unable to respond to future coal market changes. Remaining coal requirements are expected to be met from either future term contracts or purchases in the spot market. Alliant Energy, through its subsidiaries Corporate

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Services, IPL and WPL, also enters into various coal transportation agreements to meet IPL’s and WPL’s coal supply requirements. As of December 31, 2014, existing coal transportation agreements cover approximately 100% and 84% of IPL’s estimated coal transportation needs for 2015 and 2016, respectively, and 100% and 63% of WPL’s estimated coal transportation needs for 2015 and 2016, respectively.

Nearly all of the coal utilized by IPL and WPL is from the Wyoming Powder River Basin. A majorityCoal inventory levels have been impacted by continued lower natural gas prices, which can make natural gas-fired generation more economical compared to other fuel sources, such as coal. Coal inventory levels have also been impacted by lower electric demand due to milder temperatures during portions of this2015 and 2016. In 2015 and 2016, three of Alliant Energy’s coal is transported by rail-car directlysuppliers filed for restructuring under Chapter 11 of the U.S. Bankruptcy Code. Two coal suppliers have emerged from WyomingChapter 11 restructuring. There has been no significant impact to IPL’s and WPL’s EGUs, with the remainder transported from Wyoming to the Mississippi River by rail-car and then via barges to the final destination. As protection against interruptions in coal deliveries,Alliant Energy, IPL and WPL strive to maintain average coal inventory supply targets of 25 to 55 days for EGUs with year-round deliveries and 30 to 150 days (depending upon the time of year) for EGUs with seasonal deliveries. As of December 31, 2014, actual inventory days ranged from 23 to 57 days for EGUs with year-round deliveries and 72 to 80 days for EGUs with seasonal deliveries. The days on hand were computed based on actual tons of inventory divided by estimated average daily tons burned. During 2014, coal deliveries to one of WPL’s EGUs were delayed due to additional rail-car traffic for non-coal commodities. Asas a result WPL shifted some of its rail-car coal traffic to a less congested route to help avoid such delays. Coal is periodically tested from sources other than the Wyoming Powder River Basin to determine which alternative sources of coal are most compatible with EGUs. Access to alternative sources of coal is expected to provide further protection against interruptions and lessen dependence on the primary coal source.these bankruptcy filings.

Average delivered fossil fuel costs are expected to increase in the future due to price structures and adjustment provisions in existing coal contracts, rate structures and adjustment provisions in existing transportation contracts, expiration of legacy transportation contracts, fuel-related surcharges incorporated by transportation carriers and expected future coal and transportation market trends. Legacy transportation contracts at each of IPL and WPL expired at the end of 2014, which will result in higher coal transportation costs for IPL and WPL beginning in 2015. Existing coal commodity contracts with terms of greater than one year have fixed future year prices that generally reflect recent market trends. Rate adjustment provisions in older transportation contracts are primarily based on changes in the Rail Cost Adjustment Factor as published by the U.S. Surface Transportation Board. Rate adjustment provisions in more recent transportation contracts are based on changes in the All Inclusive Index Less Fuel as published by the Association of American Railroads. These more recent transportation contracts also contain fuel surcharges that are subject to change monthly based on changes in diesel fuel prices. Other factors that may impact coal prices for future commitments are increasing costs for supplier mineral rights, increasing costs to mine the coal, and changes in various associated laws and regulations. For example, emission restrictions related to SO2, NOx and mercury, along with other environmental limitations on EGUs, continue to increase and will likely limit the ability to obtain, and further increase the cost of, adequate coal supplies. Factors that may impact future transportation rates include, but are not limited to: the need for railroads to enhance and expand infrastructure, corresponding investments in locomotives and crews, and the desire to improve margins on coal movements commensurate with margins on non-coal movements.

Alliant Energy, IPL and WPL believe they are reasonably insulated against coal price volatility given their current coal procurement process, the specific coal market in their primary purchase region and regulatory cost-recovery mechanisms. The coal procurement process stressessupports periodic purchases, staggering of contract terms, stair-stepped levels of supply going forward for multiple years and supplier diversity. Similarly, given the term lengths of their transportation agreements and, as appropriate, strategic alignment of agreement expirations for negotiation purposes, Alliant Energy, IPL and WPL believe they are reasonably insulated against future higher coal transportation rates from the major railroads.

Natural Gas - Alliant Energy owns several larger natural gas-fired EGUs, including IPL’s Emery (603 MW), WPL’s Riverside (675 MW), WPL’s Neenah (371 MW) and Resources’ Sheboygan Falls (347 MW) facilities. WPL has exclusive rights to the output of Sheboygan Falls under an affiliated lease agreement. IPL and WPL also currently own several smaller natural gas-fired EGUs and IPL currently expects to convert an EGU currently fueled with coal to natural gas in the future. These facilities help meet customer demand for electricity generally during peak hour demands and when natural gas prices are low enough to make natural gas-fired generation economical compared to other fuel sources. Internally generated electric supply from natural gas-fired EGUs represented approximately 10%, 6% and 13% of Alliant Energy’s, IPL’s and WPL’s total sources of electric energy in 2014, respectively. Alliant Energy manages the gas supply to these gas-fired EGUs and provides supply through a combination of third-party deliveries and pipeline transportation and storage contracts held by IPL and WPL.

Refer to “Strategic Overview” for discussion of IPL’s construction of Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU and WPL’s proposed construction of the Riverside expansion, an approximate 650MW natural gas-fired combined-cycle EGU.

Wind - IPL’s 200 MW Whispering Willow - East wind project in Franklin County, Iowa began generating electricity in 2009. WPL’s 68 MW Cedar Ridge wind project in Fond du Lac County, Wisconsin began generating electricity in 2008. WPL’s

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201 MW Bent Tree wind project in Freeborn County, Minnesota began full generation of electricity in 2011. Internally generated electric supply from these three wind facilities represented approximately 5%, 4% and 5% of Alliant Energy’s, IPL’s and WPL’s total sources of electric energy in 2014, respectively. All or some of the renewable energy attributes associated with generation from these sources may be used in future years to comply with RES or other regulatory requirements, or sold to third parties in the form of RECs or other environmental commodities. Refer to “Properties” in Item 2 for the generating capacity of these wind projects.

Purchased Power - IPL and WPL periodically enter into PPAs and purchase electricity from wholesale energy markets to meet a portion of their customer demand for electricity. Purchased power represented approximately 40%, 47% and 33% of Alliant Energy’s, IPL’s and WPL’s total sources of electric energy in 2014, respectively. IPL’s most significant PPA is for the purchase of up to 431 MWs of capacity and the resulting energy from DAEC for a term from February 22, 2014 through December 31, 2025. WPL’s most significant PPA is for the purchase of 150 MWs of energy for a term from January 1, 2014 through December 31, 2018.


ReferIPL’s DAEC PPA - In 2013, the IUB issued an order allowing IPL to Note 1(g)proceed with a PPA for discussionthe purchase of IPL’scapacity and WPL’s rate recoveryenergy generated by DAEC located near Palo, Iowa. The IUB also authorized IPL to recover the Iowa retail portion of fuel-related coststhe cost of the DAEC PPA from Iowa retail electric customers through the energy adjustment clause. The terms of the PPA provide IPL the right to the counterparty’s entire output quantities (70% of the total plant output) in exchange for payment from IPL to the counterparty based on the amount of MWhs received by IPL. Among the terms and Note 16(b)conditions of the PPA are guarantees by the counterparty to provide minimum amounts of capacity and energy. The PPA also contains provisions for details on IPL’s and WPL’s coal, natural gas and other purchased power commitments.the replacement of energy from alternative sources under certain conditions as well as provisions that convey to IPL the potential environmental attributes associated with its portion of the output from DAEC.

Electric Transmission - IPL and WPL do not own electric transmission assets and currently receive substantially all their electric transmission services from ITC and ATC, respectively. ITC and ATC are independent for-profit, transmission-only companies and are transmission-owning members of the MISO Regional Transmission Organization, Midwest Reliability Organization and Reliability First Corporation Regional Entities. The annual transmission service rates that ITC andor ATC chargecharges their customers are calculated each calendar year using a FERC-approved cost of service formula rate template referred to as Attachment “O.” Because Attachment “O” is a FERC-approved formula rate, ITC and ATC can implement new rates each calendar year without filing a request with FERC. However, new rates are subject to challenge by either FERC or customers. If the rates proposed by ITC or ATC are determined by FERC to be unjust or unreasonable or another mechanism is determined by FERC to be just and reasonable, ITC’s or ATC’s rates would change accordingly.

Refer to “Other Future Considerations” in MDA for additional information regarding transmission service charges from ITC and ATC, andas well as discussion of potential changes to ATC’sa complaint pending with FERC regarding the level of return on equity that MISO transmission owners (including ITC and regulatory capital structure for common equity, which could resultATC) should be allowed to utilize in Alliant Energy and WPL realizing lower equity income and dividends from ATC incalculating the future.rates they charge their customers. Refer to Note 1(g) for discussion of a transmission cost rider utilized by IPL for recovery of its electric transmission service expense, and discussion of WPL’s electric transmission service expense, which is recovered from its retail electric customers through changes in base rates determined during periodic rate proceedings. Note 1(g) also discusses escrow accounting treatment for electric transmission service expense which WPL received as part of its approved retail electric rate case (2015/2016 Test Period) in July 2014 from the PSCW.through 2018 pursuant to PSCW orders. Refer to Note 18 for details of agreements between ATC and WPL.

ATC - As of December 31, 2016, ATI holds all of Alliant Energy’s investment in ATC and funds capital contributions to ATC, which are included in “Other” in the construction and acquisition expenditures table in “Liquidity and Capital Resources” in MDA. Alliant Energy currently anticipates that ATI will fund capital contributions of approximately $23 million, $14 million, $6 million and $8 million to ATC in 2017, 2018, 2019 and 2020, respectively, to help fund future proposed transmission projects. These future proposed transmission projects require approval from various regulatory agencies to construct. In addition, refer to “Other Future Considerations” in MDA for discussion of potential changes to ATC’s return on equity, which may result in changes to equity income and dividends from ATC in the future.

In 2011, Duke Energy Corporation and ATC announced the creation of DATC, a joint venture that is expected to acquire, build, own and operate new electric transmission infrastructure in North America. DATC continues to evaluate new projects and opportunities, and participates in a competitive bidding process on projects it considers to be viable. The expenditures in the construction and acquisition expenditures table in “Liquidity and Capital Resources” in MDA do not include any capital contributions for potential DATC projects.

MISO Markets - IPL and WPL are members of MISO, a FERC-approved Regional Transmission Organization, which is responsible for monitoring and ensuring equal access to the transmission system in their service territories.footprint. IPL and WPL participate in the wholesale energy and ancillary services markets operated by MISO, which are discussed in more detail below. Corporate Services acts asAs agent on behalf offor IPL and WPL, pursuant to service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within the markets operated by MISO and PJM.MISO. Corporate Services assigns such sales and purchases between IPL and WPL based on statements received from MISO and PJM.MISO. Refer to Note 18 for additional discussion of these assigned amounts.

Wholesale Energy Market - IPL and WPL participate in the wholesale energy market operated by MISO. The market dictates the process by which IPL and WPL buy and sell wholesale electricity, obtain transmission services, schedule generation and ensure resource adequacy to reliably serve load. InMISO generally dispatches the market, IPL and WPL submit day-ahead and/or real-time bids and offerslowest cost generators, while recognizing current system constraints, to reduce costs for energy. MISO evaluates IPL’s, WPL’s and other market participants’ offers, bids andpurchasers in the wholesale energy injections into, and withdrawals from, the system to economically dispatch the entire MISO system on an hourly basis. MISO settles these hourly offers and bids based on locational marginal prices, which are market-driven values based on the specific time and location of the purchase and/or sale of energy.market. The market is intended to send price signals to stakeholders about where generation or transmission system expansion is needed. In addition, MISO may dispatch generators that support reliability needs, but that would not have operated based on economic needs. In these cases, MISO’s settlement assures that these generators are made whole financially for their variable costs. IPL and WPL may also periodically engage in related transactions in PJM’s bid/offer-based wholesale energy market, which are accounted for in a similar manner as the MISO transactions.


Ancillary Services Market - IPL and WPL also participate in MISO’s ancillary services market. The ancillary services market, which integrates the procurement and use of regulation and contingency reserves with the existing wholesale energy market.market to ensure reliability of electricity supply. Regulation reserves refer to generation available to meet the moment-to-moment changes in generation that are necessary to meet changes in electricity demand. Contingency reserves refer to additional generation or demand response resources, either on-line or that can be brought on-line within 10 minutes, to meet certain major events such as the loss of a large EGU or transmission line.

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Financial Transmission Rights and Auction Revenue Rights - In areas of constrained transmission capacity, costs could be higher due to congestion and its impact on locational marginal prices. FTRs provide a hedge for certain congestion costs that occur in the MISO day-ahead energy market. MISO allocates ARRsauction revenue rights to IPL and WPL eachannually based on a fiscal year based onfrom June 1 through May 31 and historical use of the transmission system. The revenue rights associated with the allocated ARRsauction revenue rights are used by IPL and WPL to acquire FTRs through the FTR auctions operated by MISO. MISO allocates ARRs annually based on a fiscal year from June 1 through May 31. IPL’s and WPL’s current FTRs acquired from ARRs extend through May 31, 2015.

Multi-value Projects - The MISO tariff identifies coststariffs billed to IPL and WPL includinginclude costs related to various shared transmission projects, including MVPs. MVPsmulti-value projects. Such projects include new large scale transmission projects that enable the reliable and economic delivery of energy in support of documented energy policy mandates or provide economic value across multiple pricing zones within MISO. MVPthe MISO footprint. Multi-value project costs are socialized across the entire MISO footprint based on energy usage of eachusage. The MISO participant. MISO tariff coststariffs billed to IPL and WPL also include a portion of the costs related to other shared transmission projects, including projects designed to reduce market congestion, to provide interconnection to the transmission grid for new generation, and to ensure compliance with applicable reliability standards. The costs of these projects are primarily allocated to MISO participants in a way that is commensurate with the benefit to the participants’ pricing zone. The MISO transmission chargestariffs billed to IPL and WPL are expected to increase in the future due to the increased number of shared transmission projects occurring in the MISO region. Refer to “Other Future Considerations” in MDA for further discussion of MISO transmission charges billed to IPL and WPL.

Resource Adequacy - MISO conducts various studies regarding reliability of electric service to ensure its market participants have adequate resources either owned or contracted, to meet MISO’s forecasted peak load obligations plus a reserve margin. Only accredited capacity assigned to EGUs from the MISO resource adequacy process is available to meet these requirements. To connect to the transmission system, MISO requires an EGU to obtain an interconnection agreement. In order for an EGU to receive accredited capacity, it must among othermeet MISO capacity accreditation requirements, satisfy allwhich can include satisfying transmission requirements identified in its interconnection agreement prior to the MISO planning year. New EGUs like Marshalltown and the Riverside expansion, or IPL’s and WPL’s planned additional wind generation, may not initially receive full accredited capacity based on the inability to satisfy all identified transmission requirements. Therefore, full accredited capacity may not be granted to such EGUs until all identified transmission requirements are resolved. As members of MISO, IPL and WPL must adhere to these resource adequacy protocols in executing their generation resource plans.

Attachment Y Notices and System Support Resources - MISO requires its market participants (including IPL and WPL, among others) who own EGUs to submit an Attachment Y Notice if they plan to retire an EGU, reduce theEGU capacity of an EGU or suspend all or a portion of theEGU operations of an EGU for a period longer than two months. Upon receiving an Attachment Y Notice, MISO will conduct a study to determine whether all or a portion of the EGU’s capacity is necessary to maintain system reliability. If the EGU’s capacity is determined to be necessary to maintain system reliability, MISO designates the EGU as an SSR. When an EGU is required to continue to operate for system reliability, the market participant may enter into an SSR agreement and negotiate an annual revenue requirement with MISO. The annual revenue requirement for the SSR is subject to FERC approval and is assigned to load serving entities that benefit from the continued operations of the EGU. In 2013, the PSCW issued an order allowing investor-owned Wisconsin utilities to defer SSR costs incurred through December 31, 2015. Alliant Energy, IPL and WPL are currently unable to estimate the amount of aggregate SSR charges that may be assigned to IPL and WPL as load serving entities. Alliant Energy, IPL and WPL are also currently unable to estimate the impacts of any potential SSR designations on EGUs they plan to retire or modify. Refer to “Strategic OverviewProperties” in MDAItem 2 for discussion of EGUs that IPL and WPL currently plan to retire or modify, such as changing from coal-fired to an alternative fuel source, in the next few years.

FERC Order 1000 - In 2011, FERC issued Order 1000, which reforms its electric transmission planning and cost allocation requirements for public utility transmission providers. One substantial change from the order is the requirement for projects with regional cost allocation to have the federal right of first refusal removed. Incumbent public utility transmission providers, including ITC and ATC, no longer have a federal right of first refusal to build, own and operate large-scale transmission projects located within their service territory that have regional cost sharing. To comply with this requirement, MISO is creating a competitive bidding process for projects subject to the right of first refusal removal, which could lead to a potential decrease in the expected costs of impacted future transmission projects. In January 2015, FERC issued an order that denied rehearing requests and accepted MISO’s revised Order 1000 compliance filing, subject to a further compliance filing for certain changes related to definitions of projects retaining a federal right of first refusal and requirements for qualified transmission developers. Alliant Energy, IPL and WPL are currently unable to determine what impacts, if any, this order may have on their future electric transmission service charges.

Electric Environmental Matters - Refer to Note 16(e) and “Environmental Matters” in MDA for discussion of electric environmental matters, including current or proposed environmental regulations.

15




Alliant Energy Corporation
Electric Operating Information2014 2013 2012 2011 2010
Electric Operating Information - Alliant Energy2016 2015 2014
Operating Revenues (in millions):              
Residential
$994.5
 
$1,009.1
 
$975.9
 
$985.8
 
$1,001.5
Commercial658.0
 649.4
 611.4
 612.1
 619.0
Industrial799.0
 765.4
 741.8
 748.9
 762.8
Residential (a)
$1,001.1
 
$983.0
 
$994.5
Commercial (a)712.6
 667.8
 658.0
Industrial (a)787.1
 763.4
 735.1
Industrial - co-generation64.0
 59.9
 63.9
Retail subtotal2,451.5
 2,423.9
 2,329.1
 2,346.8
 2,383.3
2,564.8
 2,474.1
 2,451.5
Sales for resale:              
Wholesale206.6
 195.4
 187.6
 189.8
 196.8
Wholesale (a)256.6
 221.0
 206.6
Bulk power and other2.9
 17.7
 23.8
 52.2
 44.1
10.1
 28.5
 2.9
Other52.6
 52.0
 48.8
 47.0
 50.0
44.0
 46.9
 52.6
Total
$2,713.6
 
$2,689.0
 
$2,589.3
 
$2,635.8
 
$2,674.2

$2,875.5
 
$2,770.5
 
$2,713.6
Electric Sales (000s MWh):              
Residential7,697
 7,824
 7,679
 7,740
 7,836
Commercial6,449
 6,432
 6,352
 6,253
 6,219
Industrial11,821
 11,471
 11,555
 11,504
 11,213
Residential (a)7,152
 7,271
 7,697
Commercial (a)6,545
 6,374
 6,449
Industrial (a)10,702
 10,820
 10,813
Industrial - co-generation940
 915
 1,008
Retail subtotal25,967
 25,727
 25,586
 25,497
 25,268
25,339
 25,380
 25,967
Sales for resale:              
Wholesale3,586
 3,564
 3,317
 3,372
 3,325
Wholesale (a)4,039
 3,614
 3,586
Bulk power and other335
 763
 1,303
 1,757
 1,378
360
 1,228
 335
Other155
 152
 151
 151
 153
100
 129
 155
Total30,043
 30,206
 30,357
 30,777
 30,124
29,838
 30,351
 30,043
Customers (End of Period):              
Residential850,322
 847,350
 844,388
 842,780
 841,726
Commercial139,138
 138,520
 137,791
 136,732
 135,832
Industrial2,871
 2,881
 2,842
 2,895
 2,875
Residential (a)811,459
 809,634
 850,322
Commercial (a)141,528
 137,870
 139,138
Industrial (a)2,546
 2,544
 2,871
Other3,662
 3,657
 3,647
 3,638
 3,632
2,785
 2,930
 3,662
Total995,993
 992,408
 988,668
 986,045
 984,065
958,318
 952,978
 995,993
Other Selected Electric Data:              
Maximum summer peak hour demand (MW)5,426
 5,820
 5,886
 5,734
 5,425
5,615
 5,385
 5,426
Maximum winter peak hour demand (MW)4,803
 4,648
 4,368
 4,423
 4,591
4,559
 4,668
 4,803
Cooling degree days (a):         
Cedar Rapids, Iowa (IPL) (normal - 755)670
 884
 1,052
 887
 923
Madison, Wisconsin (WPL) (normal - 658)620
 709
 1,070
 814
 829
Cooling degree days (b):     
Cedar Rapids, Iowa (IPL) (normal - 766)971
 732
 670
Madison, Wisconsin (WPL) (normal - 662)780
 665
 620
Sources of electric energy (000s MWh):              
Coal13,818
 14,873
 14,680
 16,440
 16,366
Gas4,505
 4,738
 2,971
Purchased power:              
Nuclear (b)3,133
 5,544
 5,483
 5,483
 5,667
Nuclear3,444
 3,741
 3,133
Wind (c)1,252
 1,201
 1,188
 1,285
 1,254
1,079
 1,190
 1,252
Other (c)8,074
 5,541
 7,053
 6,244
 6,260
8,912
 6,675
 8,074
Gas2,971
 2,224
 1,285
 588
 633
Wind (c)1,390
 1,375
 1,198
 1,188
 588
1,382
 1,441
 1,390
Coal11,019
 13,040
 13,818
Other (c)212
 200
 183
 225
 232
228
 189
 212
Total30,850
 30,958
 31,070
 31,453
 31,000
30,569
 31,014
 30,850
Revenue per KWh sold to retail customers (cents)9.44
 9.42
 9.10
 9.20
 9.43
10.12
 9.75
 9.44
(a)
In 2015, Alliant Energy sold its electric distribution assets in Minnesota to Southern Minnesota Energy Cooperative. At the date of the sale, Alliant Energy had approximately 42,000 retail electric customers in Minnesota. Prior to the asset sale, the electric sales to these retail customers are included in residential, commercial and industrial retail sales. Subsequent to the asset sale, the related electric sales are included in wholesale electric sales pursuant to a wholesale power supply agreement between IPL and Southern Minnesota Energy Cooperative, which is discussed in Note 3.
(b)
Cooling degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical cooling degree days. Refer to “Gas Utility Operations” below for details of heating degree days.
(b)2013 MWhs include replacement energy provided under the Kewaunee PPA after Kewaunee was shut down in May 2013.
(c)All or some of the renewable energy attributes associated with generation from these sources may be used in future years to comply with renewable energy standards or other regulatory requirements, or sold to third parties in the form of renewable energy credits or other environmental commodities.

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Interstate Power and Light Company
Electric Operating Information2014 2013 2012 2011 2010IPL WPL
2016 2015 2014 2016 2015 2014
Operating Revenues (in millions):                    
Residential
$556.4
 
$574.3
 
$529.9
 
$543.2
 
$561.9
Commercial410.2
 409.6
 365.3
 366.0
 378.7
Industrial458.5
 442.9
 408.0
 415.4
 441.9
Residential (a)
$536.7
 
$540.3
 
$556.4
 
$464.4
 
$442.7
 
$438.1
Commercial (a)445.4
 416.3
 410.2
 267.2
 251.5
 247.8
Industrial (a)396.4
 393.7
 394.6
 390.7
 369.7
 340.5
Industrial - co-generation64.0
 59.9
 63.9
 N/A
 N/A
 N/A
Retail subtotal1,425.1
 1,426.8
 1,303.2
 1,324.6
 1,382.5
1,442.5
 1,410.2
 1,425.1
 1,122.3
 1,063.9
 1,026.4
Sales for resale:                    
Wholesale32.2
 30.0
 27.8
 29.6
 29.8
Wholesale (a)94.2
 56.4
 32.2
 162.4
 164.6
 174.4
Bulk power and other2.1
 2.0
 9.5
 24.6
 23.5
3.6
 5.1
 2.1
 6.5
 23.4
 0.8
Other33.9
 33.0
 30.6
 29.5
 28.5
29.4
 32.1
 33.9
 14.6
 14.8
 18.7
Total
$1,493.3
 
$1,491.8
 
$1,371.1
 
$1,408.3
 
$1,464.3

$1,569.7
 
$1,503.8
 
$1,493.3
 
$1,305.8
 
$1,266.7
 
$1,220.3
Electric Sales (000s MWh):                    
Residential4,164
 4,272
 4,141
 4,223
 4,295
Commercial4,099
 4,118
 4,045
 3,953
 3,944
Industrial7,132
 6,973
 7,116
 7,080
 6,961
Residential (a)3,633
 3,843
 4,164
 3,519
 3,428
 3,533
Commercial (a)4,159
 4,059
 4,099
 2,386
 2,315
 2,350
Industrial (a)5,791
 6,007
 6,124
 4,911
 4,813
 4,689
Industrial - co-generation940
 915
 1,008
 N/A
 N/A
 N/A
Retail subtotal15,395
 15,363
 15,302
 15,256
 15,200
14,523
 14,824
 15,395
 10,816
 10,556
 10,572
Sales for resale:                    
Wholesale485
 419
 418
 417
 425
Wholesale (a)1,360
 845
 485
 2,679
 2,769
 3,101
Bulk power and other59
 98
 377
 729
 683
46
 178
 59
 314
 1,050
 276
Other81
 80
 81
 84
 83
41
 67
 81
 59
 62
 74
Total16,020
 15,960
 16,178
 16,486
 16,391
15,970
 15,914
 16,020
 13,868
 14,437
 14,023
Customers (End of Period):                    
Residential445,483
 444,905
 443,802
 443,358
 443,694
Commercial81,853
 81,587
 81,203
 80,506
 80,063
Industrial1,856
 1,863
 1,836
 1,906
 1,900
Residential (a)403,558
 406,028
 445,483
 407,901
 403,606
 404,839
Commercial (a)83,936
 80,982
 81,853
 57,592
 56,888
 57,285
Industrial (a)1,511
 1,572
 1,856
 1,035
 972
 1,015
Other1,385
 1,374
 1,381
 1,381
 1,366
862
 1,050
 1,385
 1,923
 1,880
 2,277
Total530,577
 529,729
 528,222
 527,151
 527,023
489,867
 489,632
 530,577
 468,451
 463,346
 465,416
Other Selected Electric Data:                    
Maximum summer peak hour demand (MW)2,840
 3,107
 3,130
 3,131
 2,963
2,996
 3,005
 2,840
 2,681
 2,564
 2,594
Maximum winter peak hour demand (MW)2,601
 2,528
 2,404
 2,454
 2,524
2,479
 2,531
 2,601
 2,131
 2,153
 2,202
Cooling degree days (a):         
Cedar Rapids, Iowa (normal - 755)670
 884
 1,052
 887
 923
Cooling degree days (b):           
Cedar Rapids, Iowa (IPL) (normal - 766)971
 732
 670
 N/A
 N/A
 N/A
Madison, Wisconsin (WPL) (normal - 662)N/A
 N/A
 N/A
 780
 665
 620
Sources of electric energy (000s MWh):                    
Coal7,092
 6,705
 7,302
 8,456
 8,663
Gas1,838
 1,874
 1,069
 2,667
 2,864
 1,902
Purchased power:                    
Nuclear3,133
 3,592
 3,641
 3,624
 3,623
3,444
 3,741
 3,133
 N/A
 N/A
 N/A
Wind (b)798
 768
 743
 661
 606
Other (b)3,802
 3,766
 3,237
 3,094
 3,014
Gas1,069
 920
 1,081
 532
 578
Wind (b)622
 639
 579
 568
 353
Other (b)12
 22
 38
 18
 22
Wind (c)635
 757
 798
 444
 433
 454
Other (c)4,267
 3,015
 3,802
 4,645
 3,660
 4,272
Wind (c)630
 653
 622
 752
 788
 768
Coal5,598
 6,263
 7,092
 5,421
 6,777
 6,726
Other (c)6
 5
 12
 222
 184
 200
Total16,528
 16,412
 16,621
 16,953
 16,859
16,418
 16,308
 16,528
 14,151
 14,706
 14,322
Revenue per KWh sold to retail customers (cents)9.26
 9.29
 8.52
 8.68
 9.10
9.93
 9.51
 9.26
 10.38
 10.08
 9.71
(a)
In 2015, IPL sold its electric distribution assets in Minnesota to Southern Minnesota Energy Cooperative. At the date of the sale, IPL had approximately 42,000 retail electric customers in Minnesota. Prior to the asset sale, the electric sales to these retail customers are included in IPL’s residential, commercial and industrial retail sales. Subsequent to the asset sale, the related electric sales are included in IPL’s wholesale electric sales pursuant to a wholesale power supply agreement between IPL and Southern Minnesota Energy Cooperative, which is discussed in Note 3.
(b)
Cooling degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical cooling degree days. Refer to “Gas Utility Operations” below for details of heating degree days.
(b)All or some of the renewable energy attributes associated with generation from these sources may be used in future years to comply with renewable energy standards or other regulatory requirements, or sold to third parties in the form of renewable energy credits or other environmental commodities.


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Wisconsin Power and Light Company
Electric Operating Information2014 2013 2012 2011 2010
Operating Revenues (in millions):         
Residential
$438.1
 
$434.8
 
$446.0
 
$442.6
 
$439.6
Commercial247.8
 239.8
 246.1
 246.1
 240.3
Industrial340.5
 322.5
 333.8
 333.5
 320.9
Retail subtotal1,026.4
 997.1
 1,025.9
 1,022.2
 1,000.8
Sales for resale:         
Wholesale174.4
 165.4
 159.8
 160.2
 167.0
Bulk power and other0.8
 15.7
 14.3
 27.6
 20.6
Other18.7
 19.0
 18.2
 17.5
 21.5
Total
$1,220.3
 
$1,197.2
 
$1,218.2
 
$1,227.5
 
$1,209.9
Electric Sales (000s MWh):         
Residential3,533
 3,552
 3,538
 3,517
 3,541
Commercial2,350
 2,314
 2,307
 2,300
 2,275
Industrial4,689
 4,498
 4,439
 4,424
 4,252
Retail subtotal10,572
 10,364
 10,284
 10,241
 10,068
Sales for resale:         
Wholesale3,101
 3,145
 2,899
 2,955
 2,900
Bulk power and other276
 665
 926
 1,028
 695
Other74
 72
 70
 67
 70
Total14,023
 14,246
 14,179
 14,291
 13,733
Customers (End of Period):         
Residential404,839
 402,445
 400,586
 399,422
 398,032
Commercial57,285
 56,933
 56,588
 56,226
 55,769
Industrial1,015
 1,018
 1,006
 989
 975
Other2,277
 2,283
 2,266
 2,257
 2,266
Total465,416
 462,679
 460,446
 458,894
 457,042
Other Selected Electric Data:         
Maximum summer peak hour demand (MW)2,594
 2,752
 2,851
 2,761
 2,654
Maximum winter peak hour demand (MW)2,202
 2,120
 1,964
 1,991
 2,066
Cooling degree days (a):         
Madison, Wisconsin (normal - 658)620
 709
 1,070
 814
 829
Sources of electric energy (000s MWh):         
Coal6,726
 8,168
 7,378
 7,984
 7,703
Purchased power:         
Nuclear (b)
 1,952
 1,842
 1,859
 2,044
Wind (c)454
 433
 445
 624
 648
Other (c)4,272
 1,775
 3,816
 3,150
 3,246
Gas1,902
 1,304
 204
 56
 55
Wind (c)768
 736
 619
 620
 235
Other (c)200
 178
 145
 207
 210
Total14,322
 14,546
 14,449
 14,500
 14,141
Revenue per KWh sold to retail customers (cents)9.71
 9.62
 9.98
 9.98
 9.94
(a)
Cooling degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical cooling degree days. Refer to “Gas Utility Operations” below for details of heating degree days.
(b)2013 MWhs include replacement energy provided under the Kewaunee PPA after Kewaunee was shut down in May 2013.
(c)All or some of the renewable energy attributes associated with generation from these sources may be used in future years to comply with renewable energy standards or other regulatory requirements, or sold to third parties in the form of renewable energy credits or other environmental commodities.


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2) GAS UTILITY OPERATIONS
General - Gas utility operations represent the second largest operating segment for Alliant Energy, IPL and WPL. Alliant Energy’s gas utility operations are located in the Midwest with IPL providing gas service in Iowa and southern Minnesota, and WPL providing gas service in southern and central Wisconsin. In December 2014, the MPUC issued an order approving the proposed sale of IPL’s Minnesota natural gas distribution assets. Refer to Note 3 for discussion of this anticipated sale. Refer to the “Gas Operating Information” tables for additional details regarding gas utility operations. Refer to

JurisdictionsNote 1(g) -for information relating to utility natural gas cost recovery mechanisms and Note 16(b)Gas utility revenues by state were as follows (dollars in millions): for discussion of natural gas commitments.
 2014 2013 2012
 Amount Percent Amount Percent Amount Percent
IPL:           
Iowa
$282.8
 55% 
$261.2
 56% 
$216.6
 55%
Minnesota13.7
 2% 12.7
 3% 10.1
 2%
Subtotal296.5
 57% 273.9
 59% 226.7
 57%
WPL:           
Wisconsin221.0
 43% 190.9
 41% 169.6
 43%
 
$517.5
 100% 
$464.8
 100% 
$396.3
 100%

Customers - The number of gas customers and communities served at December 31, 2014 were as follows:
 Retail Customers Transportation / Total Communities
 Iowa Minnesota Wisconsin Total Other Customers Customers Served
IPL224,302
 10,712
 
 235,014
 371
 235,385
 243
WPL
 
 184,913
 184,913
 254
 185,167
 236
 224,302
 10,712
 184,913
 419,927
 625
 420,552
 479

IPL’s and WPL’s retail gas customers in the above table are billed under base rates established by the IUB, MPUC or PSCW that include recovery of and a return on investments in gas infrastructure and recovery of costs required to serve customers. Commodity, storage and transportation costs incurred by IPL and WPL are recovered pursuantprovide gas utility service to natural gas cost recovery mechanisms.a diversified base of retail customers and industries, including research, education, hospitality, manufacturing and chemicals (including ethanol). In addition, to sales of natural gas to retail customers, IPL and WPL provide transportation service to commercial and industrial customers by moving customer-owned gas through Alliant Energy’s distribution systems to the customers’ meters. Revenues are collected for this service pursuant to transportation tariffs.

Recent fluctuations in propane prices have resulted in increased customer requests to convert from propane to natural gas. When natural gas service is available for a given area, customers in such area have generally selected natural gas over propane as a more cost competitive solution for their energy needs. Alliant Energy, IPL and WPL are currently extending various natural gas distribution systems in their existing Iowa and Wisconsin service territories to serve new customer demand. Refer to “Strategic Overview” in MDA for further discussion of gas distribution systems.

Seasonality - Gas sales follow a seasonal pattern with an annual base-load of gas and a large heating peak occurring during the winter season. Natural gas obtained from producers, marketers and brokers, as well as gas in storage, is utilized to meet the peak heating season requirements. Storage contracts generally allow IPL and WPL to purchase gas in the summer and inject it into underground storage fields, and remove it from storage fields in the winter to deliver to customers. In Refer to the “Gas Operating Information2014, the” tables for details regarding maximum daily winter peak demands were as follows:demands.
DthDate
IPL296,190January 6
WPL234,837January 6

Competition- - FederalGas customers in Iowa and state regulatory policies are in placeWisconsin currently do not have the ability to bring competitionchoose their gas distributor, and IPL and WPL have obligations to theserve all their gas industry.customers. While the gas utility distribution function is expected to remain a regulated function, sales of the natural gas commodity and related services are subject to competition from third-parties. It remains uncertain if,third-parties who provide alternative fuel sources (e.g. propane). However, when natural gas service is available for a given area, customers in such area have generally selected natural gas over propane as a more cost competitive solution for their fuel needs. Alliant Energy, IPL and when, the current economic disincentivesWPL are also currently extending various gas distribution systems in their existing Iowa and Wisconsin service territories to serve new customer demand. Refer to “Strategic Overview” in MDA for smaller consumption customers to choose an alternative gas commodity supplier may be removed such that the utility business begins to face competition for the salefurther discussion of gas to those customers.distribution systems, as well as discussion of the growth element of Alliant Energy’s strategic plan, which includes accelerating the growth of customers’ gas usage.


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Gas Supply- IPL and WPL maintain purchase agreements with over 70 suppliers of natural gas from various gas producing regions of the U.S. and Canada. The majority of the gas supply contracts are for terms of six months or less, with the remaining supply contracts having terms through September 2017. IPL’s and WPL’s gas supply commitments are primarily market-based.

In more recent years, natural gas prices have fallen to levels not seen in a decade. Prices have fallen largely due to surging supply caused by shale gas production. Given the tariffs for IPL’s and WPL’s retail gas customers provide for subsequent adjustments to their rates in the cost of gas sold, the decreased natural gas prices do not have a material impact on their respective gas margins, but help IPL and WPL lower customer bills.

In providing gas commodity service to retail customers, Corporate Services administers a diversified portfolio of transportation and storage contracts on behalf of IPL and WPL. Transportation contracts with NNG, ANR, NGPLThe tariffs for IPL’s and NBPL allow accessWPL’s retail gas customers provide for subsequent adjustments to their rates for the cost of gas supplies located in the U.S. and Canada. Arrangements with FCS provide IPL withsold to these customers. As a result, natural gas delivered directly to its service territory. In prices do not have a material impact on IPL’s or WPL’s gas margins.

Gas Demand Planning Reserve Margin -2014, the maximum daily delivery capacity for IPL and WPL was as follows (in Dths):
 NNG ANR NGPL FCS NBPL Total
IPL192,599
 50,000
 76,673
 10,000
 4,085
 333,357
WPL91,056
 167,467
 
 
 
 258,523

Referare required to Note 1(g) for information relatingmaintain adequate pipeline capacity to utility natural gas cost recovery mechanismsensure they meet their customers’ maximum daily system demand requirements. IPL and Note 16(b) for discussionWPL currently have planning reserve margins of natural gas commitments.4% and 5%, respectively, above their forecasted maximum daily system demand requirements from November 2016 through March 2017.

Gas Environmental Matters - Refer to Note 16(e) and “Environmental Matters” in MDA for discussion of gas environmental matters.

Alliant Energy Corporation
Gas Operating Information2014 2013 2012 2011 2010
Gas Operating Information - Alliant Energy2016 2015 2014
Operating Revenues (in millions):              
Residential
$287.5
 
$262.5
 
$224.3
 
$269.7
 
$273.7
Commercial172.8
 150.3
 124.3
 155.1
 154.2
Industrial23.4
 21.1
 16.7
 24.5
 27.3
Residential (a)
$197.6
 
$215.1
 
$287.5
Commercial (a)109.6
 120.5
 172.8
Industrial (a)15.2
 14.3
 23.4
Retail subtotal(a)483.7
 433.9
 365.3
 449.3
 455.2
322.4
 349.9
 483.7
Transportation/other33.8
 30.9
 31.0
 27.4
 25.4
33.0
 31.3
 33.8
Total
$517.5
 
$464.8
 
$396.3
 
$476.7
 
$480.6

$355.4
 
$381.2
 
$517.5
Gas Sales (000s Dths):              
Residential(a)31,718
 29,916
 23,071
 26,891
 27,128
25,571
 26,672
 31,718
Commercial(a)23,301
 21,892
 17,115
 19,271
 18,691
18,820
 18,966
 23,301
Industrial(a)3,710
 3,803
 3,068
 3,848
 4,158
3,352
 2,997
 3,710
Retail subtotal(a)58,729
 55,611
 43,254
 50,010
 49,977
47,743
 48,635
 58,729
Transportation/other64,717
 60,261
 57,532
 52,210
 50,408
77,485
 74,162
 64,717
Total123,446
 115,872
 100,786
 102,220
 100,385
125,228
 122,797
 123,446
Retail Customers at End of Period:         
Retail Customers at End of Period (a):     
Residential373,319
 370,895
 368,708
 367,497
 366,261
366,786
 364,415
 373,319
Commercial46,180
 45,874
 45,684
 45,667
 45,552
44,587
 44,613
 46,180
Industrial428
 441
 456
 496
 549
385
 377
 428
Total419,927
 417,210
 414,848
 413,660
 412,362
411,758
 409,405
 419,927
Other Selected Gas Data:              
Heating degree days (a):         
Cedar Rapids, Iowa (IPL) (normal - 6,763)7,657
 7,232
 5,901
 6,745
 6,868
Madison, Wisconsin (WPL) (normal - 7,031)7,884
 7,627
 5,964
 6,992
 6,798
Heating degree days (b):     
Cedar Rapids, Iowa (IPL) (normal - 6,798)5,933
 6,300
 7,657
Madison, Wisconsin (WPL) (normal - 7,082)6,420
 6,667
 7,884
Revenue per Dth sold to retail customers
$8.24
 
$7.80
 
$8.45
 
$8.98
 
$9.11

$6.75
 
$7.19
 
$8.24
Purchased gas costs per Dth sold to retail customers
$5.52
 
$4.90
 
$4.94
 
$5.88
 
$6.05

$3.99
 
$4.40
 
$5.52
Gas Operating InformationIPL WPL
 2016 2015 2014 2016 2015 2014
Operating Revenues (in millions):           
Residential (a)
$110.6
 
$120.0
 
$162.5
 
$87.0
 
$95.1
 
$125.0
Commercial (a)61.9
 67.9
 96.1
 47.7
 52.6
 76.7
Industrial (a)10.6
 10.5
 17.4
 4.6
 3.8
 6.0
Retail subtotal (a)183.1
 198.4
 276.0
 139.3
 151.5
 207.7
Transportation/other20.9
 18.9
 20.5
 12.1
 12.4
 13.3
Total
$204.0
 
$217.3
 
$296.5
 
$151.4
 
$163.9
 
$221.0
Gas Sales (000s Dths):           
Residential (a)13,788
 14,472
 17,839
 11,783
 12,200
 13,879
Commercial (a)10,143
 10,166
 12,641
 8,677
 8,800
 10,660
Industrial (a)2,299
 2,239
 2,804
 1,053
 758
 906
Retail subtotal (a)26,230
 26,877
 33,284
 21,513
 21,758
 25,445
Transportation/other37,158
 34,129
 31,377
 40,327
 40,033
 33,340
Total63,388
 61,006
 64,661
 61,840
 61,791
 58,785
Retail Customers at End of Period (a):           
Residential199,326
 199,408
 208,240
 167,460
 165,007
 165,079
Commercial24,882
 25,289
 26,530
 19,705
 19,324
 19,650
Industrial212
 217
 244
 173
 160
 184
Total224,420
 224,914
 235,014
 187,338
 184,491
 184,913
Other Selected Gas Data:           
Maximum daily winter peak demand (Dth)262,409
 267,314
 296,190
 203,655
 209,289
 234,837
Heating degree days (b):           
Cedar Rapids, Iowa (IPL) (normal - 6,798)5,933
 6,300
 7,657
 N/A
 N/A
 N/A
Madison, Wisconsin (WPL) (normal - 7,082)N/A
 N/A
 N/A
 6,420
 6,667
 7,884
Revenue per Dth sold to retail customers
$6.98
 
$7.38
 
$8.29
 
$6.48
 
$6.96
 
$8.16
Purchased gas cost per Dth sold to retail customers
$4.21
 
$4.53
 
$5.54
 
$3.72
 
$4.25
 
$5.48
(a)In April 2015, IPL sold its natural gas distribution assets in Minnesota. At the date of the sale, IPL had approximately 11,000 retail gas customers in Minnesota.
(b)Heating degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical heating degree days.


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Interstate Power and Light Company
Gas Operating Information2014 2013 2012 2011 2010
Operating Revenues (in millions):         
Residential
$162.5
 
$152.8
 
$126.4
 
$155.2
 
$155.6
Commercial96.1
 85.7
 69.7
 87.8
 88.4
Industrial17.4
 16.1
 12.8
 19.0
 18.4
Retail subtotal276.0
 254.6
 208.9
 262.0
 262.4
Transportation/other20.5
 19.3
 17.8
 14.3
 11.9
Total
$296.5
 
$273.9
 
$226.7
 
$276.3
 
$274.3
Gas Sales (000s Dths):         
Residential17,839
 16,975
 12,955
 15,660
 15,923
Commercial12,641
 12,051
 9,403
 10,677
 10,596
Industrial2,804
 2,931
 2,435
 3,023
 2,869
Retail subtotal33,284
 31,957
 24,793
 29,360
 29,388
Transportation/other31,377
 32,019
 30,992
 27,720
 28,071
Total64,661
 63,976
 55,785
 57,080
 57,459
Retail Customers at End of Period:         
Residential208,240
 207,853
 207,121
 206,964
 206,979
Commercial26,530
 26,460
 26,439
 26,455
 26,470
Industrial244
 250
 260
 296
 343
Total235,014
 234,563
 233,820
 233,715
 233,792
Other Selected Gas Data:         
Maximum daily winter peak demand (Dth)296,190
 262,076
 233,456
 264,252
 277,031
Heating degree days (a):         
Cedar Rapids, Iowa (normal - 6,763)7,657
 7,232
 5,901
 6,745
 6,868
Revenue per Dth sold to retail customers
$8.29
 
$7.97
 
$8.43
 
$8.92
 
$8.93
Purchased gas cost per Dth sold to retail customers
$5.54
 
$4.96
 
$4.92
 
$5.96
 
$6.05
(a)Heating degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical heating degree days.

Wisconsin Power and Light Company
Gas Operating Information2014 2013 2012 2011 2010
Operating Revenues (in millions):         
Residential
$125.0
 
$109.7
 
$97.9
 
$114.5
 
$118.1
Commercial76.7
 64.6
 54.6
 67.3
 65.8
Industrial6.0
 5.0
 3.9
 5.5
 8.9
Retail subtotal207.7
 179.3
 156.4
 187.3
 192.8
Transportation/other13.3
 11.6
 13.2
 13.1
 13.5
Total
$221.0
 
$190.9
 
$169.6
 
$200.4
 
$206.3
Gas Sales (000s Dths):         
Residential13,879
 12,941
 10,116
 11,231
 11,205
Commercial10,660
 9,841
 7,712
 8,594
 8,095
Industrial906
 872
 633
 825
 1,289
Retail subtotal25,445
 23,654
 18,461
 20,650
 20,589
Transportation/other33,340
 28,242
 26,540
 24,490
 22,337
Total58,785
 51,896
 45,001
 45,140
 42,926
Retail Customers at End of Period:         
Residential165,079
 163,042
 161,587
 160,533
 159,282
Commercial19,650
 19,414
 19,245
 19,212
 19,082
Industrial184
 191
 196
 200
 206
Total184,913
 182,647
 181,028
 179,945
 178,570
Other Selected Gas Data:         
Maximum daily winter peak demand (Dth)234,837
 193,628
 176,207
 177,041
 179,924
Heating degree days (a):         
Madison, Wisconsin (normal - 7,031)7,884
 7,627
 5,964
 6,992
 6,798
Revenue per Dth sold to retail customers
$8.16
 
$7.58
 
$8.47
 
$9.07
 
$9.36
Purchased gas cost per Dth sold to retail customers
$5.48
 
$4.83
 
$4.97
 
$5.77
 
$6.06
(a)Heating degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical heating degree days.

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3) OTHER UTILITY OPERATIONS - STEAM - IPL’s Prairie Creek facility is the primary source of steam for IPL’s two high-pressure steam customers. IPL’s largest high-pressure steam customer accounts for approximately 90% of IPL’s steam revenues. This customer isThese customers are each under contract through 2025 for minimum quantities of annual steam usage, of at least 3.8 million Dths, with certain conditions. IPL’s other high-pressure steam customer is under contract through 2025 for annual steam usage of at least 0.2 million Dths for 2015 and at least 0.3 million Dths for 2016 through 2025, with certain conditions.

D. INFORMATION RELATING TO NON-REGULATED OPERATIONS

ResourcesAEF manages a portfolio of wholly-owned subsidiaries and additional investments through the following distinct platforms:

Non-regulated Generation - owns Sheboygan Falls, a 347 MW, simple-cycle, natural gas-fired EGU near Sheboygan Falls, Wisconsin, which is leased to WPL for an initial period of 20 years ending in 2025, and the 99 MW Franklin County wind projectfarm in Franklin County, Iowa. In February 2017, FERC issued an order approving the transfer of the Franklin County wind farm from AEF to IPL. Alliant Energy and IPL currently expect to complete this transfer in 2017.

Transportation - includes a short-line railway that provides freight service between Cedar Rapids, Iowa and Iowa City, Iowa; a barge terminal and hauling services on the Mississippi River; and other transfer and storage services.

Other non-regulated investments - includes ATI’s partial ownership interest in WPL Transco,ATI, which currently holds all of Alliant Energy’s ownership interestinvestment in ATC, real estate investments, two corporate airplanes and several other modest investments.

ITEM 1A. RISK FACTORS

You should carefully consider each of the risks described below relating to Alliant Energy, IPL and WPL, together with all of the other information contained in this combined Annual Report on Form 10-K, before making an investment decision with respect to our securities. If any of the following risks develop into actual events, our business, financial condition or results of operations could be materially and adversely affected and you may lose all or part of your investment.

Our business is significantly impacted by government legislation, regulation and legislationoversight - We are subject to extensive regulation by federal and state regulatory authorities, which significantly influences our operations and our ability to timely recover costs from customers and earn appropriate rates of return. In particular, regulatoryRegulatory authorities with jurisdiction over public utilities, including the IUB, the PSCW the MPUC and FERC, regulate many aspects of our operations. Our operationsWe are also governedsubject to oversight and monitoring by organizations such as the North American Electric Reliability Corporation, the Pipeline and Hazardous Materials Safety Administration, and the Midcontinent Independent System Operator, Inc. Operations impacted by these regulatory groupsThe impacts on our operations include: the amount and timing of changes to rates charged to our customers; authorized rates of return of IPL, WPL and ATC; our ability to site and construct new generating facilities and recover such costs, such as the natural gas-fired generating facilities in Marshalltown, Iowa and Beloit, Wisconsin, and future wind projects to utilize our remaining available wind sites, and the amount of costs associated therewith that may be recovered from customers;renewable energy projects; the installation of environmental emission controls equipment and the amountrecovery of costs for the construction and maintenance of such equipment that may be recovered from customers;associated costs; our ability to decommission generating facilities and recover thesuch costs incurred to decommission the facilities and the remaining carrying value of suchthese facilities; our ability to site, construct and constructrecover costs for new natural gas pipelines; our ability to recover costs to upgrade our natural gas transmission and distribution systemsystems to comply with the anticipated Pipeline and Hazardous Materials Safety Administration requirements that have not yet been finalized; the amount of certain sources of energy we must use, such as renewable sources and reductions in energy usage by customers;sources; our ability to purchase generating facilities and recover the amount of costs associated therewith that may be recovered from customers;therewith; our ability to sell utility assets and any conditions placed upon the sale of such assets, such as the sale of our Minnesota gas and electric distribution assets; the rates paid to transmission operators and the amount of those costs, and how those costs are recovered from customers; our ability to enter into purchased power agreements and recover the amount of costs associated therewith, and how those costs are recovered from customers;therewith; resource adequacy requirements, energy capacity standards, what forms of energy are considered when determining whether we meet those standards, and when new facilities such as IPL’s Marshalltown Generating Station, and WPL’s proposed Riverside Energy Center expansion and IPL’s and WPL’s planned additional wind generation may be fully creditedaccredited with energy capacity; the allocation of expenditures by transmission companies on transmission network upgrades and our ability to recover costs associated therewith from customers;therewith; reliability; safety; the issuance of securities; accounting matters; and transactions between affiliates. Failure to obtain approvals from regulatory authorities for any of these matters failure to receive approvals in a timely manner, or receiving approvals with uneconomical conditions may adversely impact our ability to achieve our strategic plan, cause us to record an impairment of our assets, andand/or have a material adverse impact on our financial condition and results of operations.


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These regulatory authorities and organizations are also empowered to impose financial penalties and other sanctions, if we are found to have violated statutes and regulations governing utility operations. While we believe we comply in all material respects with applicable laws and regulations governing us, state or federal agencies may not agree and may find that we violated a law or regulation. Such a finding could cause fines or penalties or could require usincluding requirements to implement new compliance programs, which could increase our costs of compliance and may adversely impact our financial condition and results of operations.

Our utility financial condition is influenced by how regulatory authorities establish the rates we can charge our customers, our authorized rates of return and common equity levels, and the amount of deferred costs that may be recovered from customers. Our ability to timely obtain rate adjustments to earn authorized rates of return depends upon timely regulatory

action under applicable statutes and regulations, and we cannot assure that rate adjustments will be obtained or authorized rates of return on capital will be earned.guaranteed. In future rate cases, IPL and WPL may not receive an adequate amount of rate relief to recover all costs and earn their authorized rates of return, rates may be reduced, rate refunds may be required, rate adjustments may not be approved on a timely basis, costs may not be otherwise recovered through rates, future rates may be temporarily frozen, (as is the case for IPL’s and WPL’s retail electric base rates through the end of 2016) and authorized rates of return on capital may be reduced. As a result, we may experience adverse impacts on our financial condition and results of operations.

We are subject to a wide variety of periodically changing statutes, regulations including and in addition to those described above, which are constantly changing.rules for energy market operations, grid management and reliability. State and federal election results may serve as a catalyst for legislative and regulatory changes. Changes in statutes, regulations and rules or the imposition of additional regulations and rules may require us to incur additionalincrease our costs or change our business operations or our business plan,plans, which may have an adverse impact on our financial condition and results of operations.

Provisions of the Wisconsin Utility Holding Company Act limit our ability to invest in non-utility activities. Takeover attempts by potential purchasers who might be willing to pay a premium for our stock are also limited by certain provisions of the Wisconsin Utility Holding Company Act and the delays and conditions that generally result from the requirement that regulatory authorities approve such a transaction. Change driven by technology and evolving customer expectations, intentional or inadvertent policy changes could impact all of our business model competitiveness and accordingly our financial results.

Large constructionConstruction projects are subject to delays and cost increases that may not be recovered from customers - Our strategic plan includes constructing natural gas-fired generating facilities, constructing renewable generating facilities, installing environmental control equipment at our newer and more efficient coal-fired generating facilities, and making other large-scale improvements to such generating facilities, and large-scale additions and upgrades to our naturalelectric and gas distribution system.systems. These large construction projects are subject to various risks that could cause costs to increase or cause delays in completion. These risks include changes in costs of materials, equipment, commodities, fuel or labor; shortages in materials, equipment and qualified labor; changes to the scope or timing of the projects; general contractors or subcontractors not performing as required under their contracts; the inability to agree to contract terms or disputes in contract terms; poor initial cost estimates; work stoppages; adverse weather conditions; the inability to obtain necessary permits in a timely manner; adverse interpretation or enforcement of permit conditions; changes in applicable laws or regulations; governmental actions; legal action; unforeseen engineering or technology issues; limited access to capital; and other adverse economic conditions. We may not be able to recover all costs for the projects in rates and face increased risk of potential impairment of our project investment if a construction project is not completed or is delayed, or final costs exceed expectations or the costs approved by our regulators, for example, if theIPL’s Marshalltown Generating Station or expansion of wind generation exceeds the respective cost cap approved by the IUB. Inability to recover costs, or inability to complete the project in a timely manner, could adversely impact our financial condition and results of operations.

Demand for energy may decrease - Our results of operations are affected by the demand for energy in our service territories. We could lose customers, and therefore see lower demand for energy, due to economic conditions, customers constructing their own generation facilities, higher costs and rates charged to customers, or loss of service territory or franchises. Communities in our service territory have considered municipalization of both electric and gas systems, which, if successful, could reduce the number of customers we serve, reducing the demand for our energy. Further, the energy conservation and technological advances that increase energy efficiency may temporarily or permanently reduce the demand for energy products. In addition, state and/or federal regulations require mandatory conservation measures, which would reduce the demand for energy. We may lose wholesale customers such asin addition to Jo-Carroll Energy, Inc., WPPI Energy and Great Lakes Utilities who have provided us notice of their intent to terminate their wholesale power supply agreements. Continuing technology improvements, andtax incentives, regulatory developments and customer concern regarding their environmental and carbon footprint are making customer- and third party-owned generation technologies such as rooftop solar systems, wind turbines, microturbines and battery storage systems more cost effective, attractive and feasible for more of our customers. As more customers utilize their own generation, demand for energy from us may decline.decline and negatively impact the affordability of our services for remaining customers. Future economic growth may not create enough growth for us to replace the lost energy demand from these customers. The loss of sales due to lower demand for energy may cause our rates to increase for remaining customers, as our rates must cover our fixed costs. The loss of customers, the inability to replace those customers with new customers, and the decrease in demand for energy could negatively impact our financial condition and results of operations.


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Regional and national economic conditions could have an unfavorable impact on us - Our utility and non-regulated businesses follow the economic cycles of the customers we serve and credit risk of counterparties we do business with. Adverse economic conditions in our service territories can adversely affect the financial condition of our customers and

reduce their demand for electricity and natural gas. Reduced volumes of electricity and natural gas sold, or the inability to collect unpaid bills from our customers from adue to deterioration in national or regional economic conditions, could adversely impact our financial condition and results of operations.

Our operating results may fluctuate on a seasonal and quarterly basis and can be adversely affected by the impacts of weather - Our electric and gas utility businessesutilities are seasonal businesses and weathertemperature patterns can have a material impact on their operating performance. Demand for electricity is greater in the summer months associated with higher air conditioning needs. In addition, market prices for electricity generally peak in the summer due to the higher demand. Conversely, demand for natural gas depends significantly upon weathertemperature patterns in winter months due to heavy use in residential and commercial heating. As a result, our overall operating results in the future may fluctuate substantially on a seasonal basis. In addition, we have historically generated less revenues and income when weather conditionstemperatures are warmer in the winter andand/or cooler in the summer. Thus, unusually mild winters andand/or summers could have an adverse effect on our financial condition and results of operations.

We are subject to numerous environmental laws and regulations, compliance with which could be difficult and costly, and pursuant to which we could incur material liabilities - We are subject to environmental laws and regulations that affect many aspects of our past, present and future operations. The environmental laws and regulations govern air emissions, ambient air quality standards, water quality, cooling water intake structures, wastewater discharges, the generation, transport and disposal of coal combustion residuals and other solid wastes and hazardous substances, clean-up of contaminated sites, and protection of natural resources.resources and wildlife. These laws and regulations require us to obtain and comply with a wide variety of environmental registrations, licenses, permits, inspections and other approvals, which are subject to renewal proceedings and legal challenges. Environmental laws and regulations can also require us to restrict or limit the output of certain facilities or the use ofto combust certain fuels, to install emissionenvironmental controls equipmentand implement operational practices at our facilities, manage generation system dispatch within emissions limitations and constraints, clean up spills and correct environmental hazards and other contamination. We may be required to pay all or a portion of the costs to remediate (i.e., clean-up) sites where our past activities, or the activities of certain other parties, caused environmental contamination, including lakebeds, sites of manufactured gas plants operated by our predecessors.predecessors and sites where asbestos was used in the past. Compliance with these regulations can significantly increase capital spending, operating costs and plant down-times, and can negatively affect the affordability of rates we charge our services for customers. We cannot predict with certainty the amount and timing of all future expenditures (including the potential or magnitude of any fines or penalties, includingas well as the severity of any restriction on our operations) necessary to comply with, or as a result of liabilities under, these environmental laws and regulations, although we expect the expenditures to be material.

We are also subject to a Consent DecreeDecrees between each of IPL and WPL the EPA and the Sierra Club,various environmental agencies and organizations, which resolved environmental claims related to air emissions at certain WPL coal-fired generating facilities. The Consent Decree requiresDecrees require construction of specific emissionenvironmental controls equipment, establishesestablish emission rate limits, requiresrequire retirement or fuel switching of certain facilities, and requiresrequire IPL and WPL to complete certain environmental mitigation projects.

Although we believe we comply in all material respects with currently applicable environmental laws, regulations, and the Consent Decree,Decrees, we may be subject to regulatory enforcement action by state or federal agencies should we operate out of compliance. In some instances, complying with certain environmental regulations may not be sufficient to satisfy the obligations of the Consent DecreeDecrees or other operating regulations discussed earlier. In addition, citizen groups and private individuals may bring legal action against regulatory agencies or bring citizen enforcement actions against us claiming that the environmental requirements are not being sufficiently enforced by regulatory agencies. For example, the Consent DecreeDecrees resulted from allegations originally raised by the Sierra Club that IPL and WPL violated various provisions of the Clean Air Act. If we are unsuccessful defending or settling such litigation by governmental agencies, citizen groups, or individuals, we could be subject to restrictions or prohibitions on operating our generationgenerating facilities, costly upgrades to our generating facilities, payment of damages or fines, requirements to complete other beneficial environmental projects, and litigation costs, all of which could be material. An adverse result in such legal actions could have a material adverse impact on our financial condition and results of operations. In addition, we may also be subject to third party environmental claims relating to property damage or personal injury that arise from our operations.

We are subject to existing and potential future governmental mandates to provide customers with renewable energy and energy conservation offerings. These mandates are designed in part to mitigate the potential environmental impacts of utility operations. Failure to meet the requirements of these mandates may result in fines or penalties, which could have a material adverse effect on our results of operations. If our regulators do not allow us to recover all or a part of the costs incurred to comply with the mandates, it could have a material adverse effect on our results of operations.

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Existing environmental laws or regulations may be revised and new laws or regulations seeking to protect the environment and natural resources may be adopted or become applicable to us. Areas in our service territories that are currently attainment areas under National Ambient Air Quality Standards could be designated as non-attainment areas due to new air monitoring results.results or more stringent air quality standards. These revised and new laws or regulations and any areas in our service territories designated as non-attainment may require regulation of hazardous air pollutants including mercury, nitrogen oxide, sulfur dioxide, carbon dioxide (CO2) and other greenhouse gases (GHG) emissions, particulates,particulate matter, coal ash and other coal combustion products, wastewater discharges, cooling water intake structures, and threatened, endangered or invasive species. Federal and state election results, such as the election of a new President of the U.S., may serve as a catalyst for regulatory changes. Such changes could materially increase our cost of compliance. Our strategic plan was developed in part to comply with expected environmental laws and regulations as we anticipate they will be finally adopted. Revision of existing environmental laws or regulations may cause: (1) state utility commissions to not approve our plans to install environmental emission controls equipment at our existing generating facilities or not allow us to recover costs of such projects; (2) state utility commissions to not approve costs of emission allowances purchased to comply with environmental regulations that are no longer applicable to our operations; (3) co-owners in our jointly-owned facilities to not agree with our decision to move forward with and the timing of these projects; or (4) our current plans and/or past actions to not meet new requirements. These outcomes could have a material adverse effect on our financial condition and results of operations.

Actions related to global climate change and reducing GHG emissions could negatively impact us - The primary GHG emitted from our utility operations is CO2 from combustion of fossil fuels at our electric generating facilities, which are primarily coal-firedfossil-fueled facilities. We could incur costs or other obligations to comply with any GHG regulations that are adopted in the future, and could become the target of legal claims or challenges, because generating electricity using fossil fuels emits CO2 and other GHGs. Further, investors may determine that we are too reliant on fossil fuels and not buy shares of our common stock, or sell shares of our common stock, which may cause our stock price to decrease. In 2013, a series of actions were announced to reduce carbon emissions, prepare the U.S. for the impacts of climate change, and lead international efforts to address global climate change. In November 2014, future targets for GHG emission reductions for2015, the U.S. were announced in anticipation of achievingjoined the Paris Agreement, a global agreement that commits participating countries to setting nationally determined climate agreement.targets to reduce GHG emissions and establishes a framework for reporting progress towards achieving these goals.

The following are someEPA has proposed and adopted regulations governing GHG emissions that are expected to impact our operations. In January 2014,2015, the EPA published proposed regulations governing GHG emissions from new generating facilities, which would impact IPL’s Marshalltown Generating Station in Iowa and WPL’s proposed Riverside Energy Center expansion in Wisconsin. In June 2014,2015, the EPA issued itspublished regulations under Clean Air Act Section 111(d) proposal to reduce CO2 emissions from existing fossil-fueled electric generating facilities. The EPA’s proposal isfacilities, otherwise known as the Clean Power Plan. These EPA regulations are based on broad measures to lower CO2 emissions, which could impact the dispatch of existing fossil-fueled generating facilities and the fuel mix used to generate electricity, and require other actions in order to achieve CO2 emission reduction goals. Duegoals including fossil-fueled generating unit heat rate improvements, expansion of renewable energy resources and demand-side energy efficiency measures. The EPA’s GHG regulations are currently subject to litigation, and the uncertainty ofnew presidential administration may change or repeal the regulations, making the final form of the GHG emissions regulations and solutions,uncertain. As a result of this uncertainty, strategies to comply with the regulations, including available control technologies to comply with regulations to reduce GHG emissions, including CO2,or other allowed compliance measures, are unpredictable and we cannot provide any assurance regarding the potential impacts such futurethese regulations would have on our operations. The impacts of such proposalsthese regulations could have a material adverse impact on our financial condition and results of operations.

Threats of terrorism and catastrophic events that could result from terrorism may impact our operations in unpredictable ways - We are subject to direct and indirect effects of terrorist threats and activities. Generating,Generation, transmission and distribution facilities, in general, have been identified as potential targets of physical or cyber attacks. Physical attacks on transmission and distribution facilities that appeared to be terrorist-style attacks have occurred in the recent past.occurred. The risks posed by such attacks could include, among other things, the inability to generate, purchase or distribute electric energy or obtain fuel sources, the increased cost of security and insurance, the disruption of, volatility in, or other effects on capital markets, and a decline in the economy within our service territories, all of which could adversely impact our financial condition and results of operations. In addition, the cost of repairing damage to our generating facilities and infrastructure due to acts of terrorism, and the loss of revenue if such events prevent us from providing utility service to our customers, could adversely impact our financial condition and results of operations.

A cyber attack may disrupt our operations or lead to a loss or misuse of confidential and proprietary information or potential liability - We operate in an industry that requires the continuous use and operation of sophisticated information technology systems and network infrastructure. Cyber attacks targeting our electronic control systems used at our generating facilities and for electric and gas distribution systems, such as allegedly occurred in Ukraine, could result in a full or partial disruption of our electric and/or gas operations. Any disruption of these operations could result in a loss of service to

customers and a significant decrease in revenues, as well as significant expense to repair system damage and remedy security breaches. We have instituted certain safeguards to protect our operational systems and information technology assets. FERC, through the North American Electric Reliability Corporation, requires certain safeguards be implemented to deter cyber attacks. The safeguards we haveassets, which may not always be effective due to the evolving nature of cyber attacks and cyber security. We cannot guarantee that such protections will be completely successful in the event of a cyber attack. If the technology systems were to fail or be breached

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by a cyber attack or a computer virus, and not be recovered in a timely fashion, we may be unable to fulfill critical business functions and confidential data could be compromised, adversely impacting our financial condition and results of operation.

In addition, in the ordinary course of business, we collect and retain sensitive information including personal information about our customers, shareowners and employees. In some cases, we outsource administration of certain functions to vendors that could be targets of cyber attacks. For example, we outsource administration of our employee health insurance to Anthem. Anthem was recently the target of a cyber attack.attack in 2014. Any theft, loss and/or fraudulent use of customer, shareowner, employee or proprietary data as a result of a cyber attack could subject us to significant litigation, liability and costs, as well as adversely impact our reputation with customers and regulators, among others.

We may not be able to fully recover costs related to commodity prices - The prices that we may obtain for electric energysales may not compensate for changes in delivered coal, natural gas, coal or electric energy spot-market costs, or changes in the relationship between such costs and the market prices of electric energy. As a result, we may be unable to pass on the changes in costs to our customers, especially at WPL where we do not have a retail electric automatic fuel cost adjustment clause, which would allow for more consistent and timely cost recovery.

We are exposed to changes in the price and availability of natural gas. In addition to supplying natural gas to our natural gas customers, we also have responsibility to supply natural gas to certain natural gas-fired electric generating facilities that we own. Our strategic plan includes increasing our reliance on natural-gas fired electric generating facilities, particularly the new facilities planned in Marshalltown, Iowa and Beloit, Wisconsin, and coal-fired facilities expected to switch from coal becauseto natural gas as the majorityprimary fuel type. This increases our exposure to market prices of natural gas, which have remained low recently, but have been volatile in the past. We have natural gas supply contracts in place, which are either fixed price in nature or market-based. As some of the electricity generated bycontracts are market-based, and some of the contracts are short-term, we may not be able to purchase natural gas with terms and prices as favorable as the current contracts. Natural gas prices may increase due to disruption of production or transportation of natural gas, failure to drill new wells and reduced supply generally, or regulatory developments that increase the cost of natural gas extraction methods, including fracking. Price increases may cause us is fromto incur additional costs to purchase natural gas, which may not be fully recovered through rates and may adversely impact our coal-fired generating facilities.financial condition and results of operations.

We are exposed to changes in the price and availability of coal. We have contracts of varying durations for the supply and transportation of coal for most of our existing generating capability, but as these contracts end or otherwise are not honored, we may not be able to purchase coal on terms as favorable as the current contracts. Further, we currently rely on coal primarily from the Powder River Basin in Wyoming and any disruption of coal production in, or transportation from, that region, including due to bankruptcy of coal mining companies, may cause us to incur additional costs which may not be fully recovered through rates. Increases in prices and costs due to disruptions that are not fully and timely recovered in rates may adversely affect our financial condition and results of operations.

We are exposed to changes in the price and availability of natural gas. In addition to supplying natural gas to our natural gas customers, we also have responsibility to supply natural gas to certain natural gas-fired electric generating facilities that we own. Our strategic plan includes increasing our reliance on natural-gas fired electric generating facilities, particularly the new facilities planned in Marshalltown, Iowa and the Riverside Energy Center expansion in Beloit, Wisconsin, and coal-fired facilities expected to switch from coal to natural gas as the primary fuel type, such as IPL’s M.L. Kapp facility. This increases our exposure to market prices of natural gas, which have remained low recently, but have been volatile in the past. We have natural gas supply contracts in place, which are generally short-term in duration. The natural gas supply commitments are either fixed price in nature or market-based. As some of the contracts are market-based, and all of the contracts are short-term, we may not be able to purchase natural gas with terms and prices as favorable as the current contracts. Natural gas prices may increase due to disruption of production or transportation of natural gas, such as the pipeline explosion in Manitoba, Canada in January 2014, or regulatory developments that increase the cost of natural gas extraction methods, including fracking. Price increases may cause us to incur additional costs to purchase natural gas, which may not be fully recovered through rates and may adversely impact our financial condition and results of operations.

We may not be able to fully recover higher transmission costs related to changing transmission reliability requirements - Both IPL and WPL pay for the use of the interstate electric transmission system that they do not own or control. Rates charged to IPL and WPL for such transmission service are regulated by FERC. FERC also regulates transmission owners’ operations in order to support the reliability of the transmission network. Changes are occurring in the transmission network, which are requirednecessary to, among other things, accommodate renewable energy and the decommissioning of older coal-fired generating facilities.facilities and prepare for potential compliance with future GHG regulations. These changes include socializing certain transmission network upgrades and system support resource payments, which may increase transmission costs to IPL and WPL. The prices that IPL and WPL charge for electric energy may not totally compensate for the increase in such transmission costs. We may not be able to fully or timely pass on the increases in such transmission costs to our customers. In addition, if the transmission cost rider at IPL isor escrow accounting treatment of transmission costs at WPL are amended or removed, we may not be able to fully recover IPL’s full transmission costs. Inability to fully recover transmission costs in a timely manner may adversely impact our financial condition and results of operations.


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We are dependent on the capital markets and could be negatively impacted by disruptions in the capital markets - Successful implementation of our strategic plan and other long-term business strategies is dependent upon our ability to access the capital markets under competitive terms and rates. We have forecasted capital expenditures of approximately $4.2$6 billion over the next four years. Disruption, uncertainty or volatility in those markets could increase our cost of capital or limit the availability of capital. Disruptions

could be caused by Federal Reserve policies and actions, U.S. debt management concerns, U.S. debt limit and budget debates including government shutdowns, European sovereign debt concerns, currency concerns, economic downturn or uncertainty, monetary policies, a negative view of the utility industry or our company, failures of financial institutions, U.S. debt management concerns, U.S. debt limit and budget debates including government shutdowns, European and worldwide sovereign debt concerns, other global or geopolitical events, or other factors. Any disruptions could adversely impact our ability to implement our strategic plan.

We rely on our strong credit ratings to access the credit markets. If our credit ratings are downgraded for any reason, we could pay higher interest rates in future financings, the pool of potential lenders could be reduced, borrowing costs under existing credit facilities could increase, our access to the commercial paper market could be limited, or we could be required to provide additional credit assurance, including cash collateral, to contract counterparties. If our access to capital were to become significantly constrained or costs of capital increased significantly due to lowered credit ratings, prevailing industry conditions, regulatory constraints, the volatility of the capital markets or other factors, our financial condition and results of operations could be significantly adversely affected.

We are subject to employee workforce factors that could affect our businesses - We are subjectoperate in an industry that requires many of our employees to employee workforce factors, including loss or retirementpossess specialized technical skills. Many of key personnel, and the availability of, and our ability to recruit, qualified personnel, which could affect our businesses and our financial condition and results of operations. Further, our workforce includes a significant number of employees whowith these specialized skills are nearing retirement. We need employees with specialized and technical skills in order to achieve our strategic plan. It may be difficult to hire and retain current employees with these specializedreplacements due to labor market conditions, the length of time needed to acquire the skills, especially as they near retirement, and it may be difficult to find new employees with the necessary skills.general competition for talent. We are also subject to collective bargaining agreements with approximately 2,4002,200 employees. Any work stoppage experienced in connectionsconnection with negotiations of collective bargaining agreements could adversely affect our financial condition and results of operations as well as our ability to implement our strategic plan.

We face risks associated with operating electric and natural gas infrastructure - The operation of electric generating facilities involves many risks, including start-up risks, breakdown or failure of equipment, failure of generating facilities including wind turbines, the dependence on a specific fuel source, including the supply and transportation of fuel, the risk of performance below expected or contracted levels of output or efficiency, employee safety, operator error and compliance with mandatory reliability standards. The operation of our energy delivery infrastructure involves many risks, including breakdown or failure of equipment and fires developing from our power lines. In addition, the North American transmission grid is highly interconnected and, in extraordinary circumstances, disruptions at particular points within the grid could cause an extensive power outage in our delivery systems. Increased utilization of customer- and third party-owned generation technologies could disrupt the reliability and balance of the electricity grid. Further, the transmission system in our utilities’ service territories is constrained, limiting the ability to transmit electric energy within our service territories. The transmission constraints could result in an inability to deliver energy from generating facilities, particularly wind generating facilities, to the national grid, or to access lower cost sources of electric energy. We also have obligations to provide electric service under regulatory requirements and contractual commitments. Failure to meet our service obligations could adversely impact our financial condition and results of operations.

The operation of our natural gas transmission and distribution activitiesinfrastructure also involves many risks, such as leaks, explosions, and mechanical problems and employee safety, which could cause substantial financial losses. These risks could result in loss of human life, particularly in highly populated areas, significant damage to property, environmental emissions, impairment of our operations and substantial losses to us. We are also responsible for compliance with new and changing mandatory reliability and safety standards, including anticipated new regulations under the Pipeline and Hazardous Materials Safety Administration. Our infrastructure is aging, which could impact safety and compliance with possible new regulations. Failure to meet these standards could result in substantial fines. Electric and gas infrastructure operations could be impacted by future compliance with the Clean Power Plan. We also have obligations to provide service under regulatory requirements and contractual commitments. Failure to meet our service obligations could adversely impact our financial condition and results of operations.


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We face risks associated with deployment and integration of a new customer billing and information system - We are implementingimplemented a new customer billing and information system for IPL and WPL, which is currently expected to be deployedwas completed in 2015.2016. This new customer billing and information system will househouses all customer records, and processprocesses metering, billing and payment and on-line transactions. ImplementingIntegrating a new customer system is complex, costly and time consuming. If we do not successfully implement the system and new related processes or if it doesdo not operate as intended, it could result in substantial disruptions to our business, including customer billings and collections, which could have a material adverse effect on our financial condition and results of operations.

Storms or other natural disasters may impact our operations in unpredictable ways - Storms and other natural disasters, including events such as floods, tornadoes, blizzards, ice storms, droughts, solar flares or droughtspandemics may adversely impact our ability to generate, purchase or distribute electric energy or obtain fuel sources. or other critical supplies. We incur costs for preventive measures to replace, reinforce and modernize operating infrastructure that will provide for further grid resiliency.

In addition, we could incur large costs to repair damage to our generating facilities and infrastructure, or costs related to environmental remediation, due to storms or natural disasters. Severe storms may also impact our natural gas infrastructure. The restoration costs may not be fully covered by insurance policies. Damage to assets could also require us to take impairments, such as occurred with our damaged Sixth Street Generating Station after a flood. Some costs may not be recovered in rates or through insurance, including damaged assets, or there could be significant delays in cost recovery. Storms and natural disasters may prevent our customers from being able to operate or may significantly slow growth or cause a decline in the economy within our service territories. The reduced demand for energy could cause lower sales and revenues, which may not be replaced or recovered in rates. Any of these items could adversely affect our financial condition and results of operations.

We may incur material post-closing adjustments related to past asset and business divestitures - We previouslyhave sold certain non-regulated subsidiaries such as RMT, Inc. (RMT) and Whiting Petroleum Corporation (Whiting Petroleum), a non-regulated subsidiary.as well as regulated assets such as our Minnesota electric and natural gas distribution assets. We might be requiredmay continue to make payments onincur liabilities that we retainedrelating to our previous ownership of, or the transactions pursuant to the termswhich we disposed of, the sale. In addition,these subsidiaries and assets. For example, Alliant Energy also continues to guarantee RMT’s performance obligations related to certain of RMT’s projects that were commenced prior to Alliant Energy’s sale of RMT. RequiredIn addition, Alliant Energy Resources, LLC, as the successor to a predecessor entity that owned Whiting Petroleum and a wholly-owned subsidiary of Alliant Energy Finance, LLC, continues to guarantee the partnership obligations of an affiliate of Whiting Petroleum under general partnership agreements in the oil and gas industry, including liabilities with respect to the future abandonment of certain platforms off the coast of California and related onshore plant and equipment owned by the partnerships. Any potential liability under these guarantees may depend on a number of factors outside of our control, including the financial condition of RMT, Whiting Petroleum and/or their respective assignees. Any required payments on retained liabilities, guarantees or guaranteesindemnification obligations with respect to RMT, Whiting Petroleum, the sales of our Minnesota electric and natural gas distribution assets, or other future asset or business divestitures, such as the anticipated sales of our Minnesota electric and gas distribution assets, could have an adverse effect on our financial condition and results of operations.

We face risks related to non-regulated operations - We rely on our non-regulated operations for a portion of our earnings. If our non-regulated investments do not perform at expected levels, we could experience diminished earnings. In particular, Franklin County Wind LLC is a non-regulated subsidiary that operates a non-regulated 99 MW wind project in Franklin County, Iowa, referred to as the Franklin County wind project. The Franklin County wind project does not currently have a buyer of its electrical output and its electrical output is being sold into the general market at prevailing market prices. Failure to find a buyer for the output, or selling the output at disadvantageous market prices, may cause the project to lose money or cause an impairment of its assets. Such losses or impairments could adversely impact our financial condition and results of operations. In addition, a variety of operating parameters, including adverse weather conditions, transmission constraints and breakdown or failure of equipment, could result in a material adverse impact on our financial condition and results of operations.

We are subject to limitations on our ability to pay dividends - Alliant Energy is a holding company with no significant operations of its own. Accordingly, the primary sources of funds for Alliant Energy to pay dividends to its shareowners are dividends and distributions from its subsidiaries, primarily its utility subsidiaries. Our subsidiaries are separate and distinct legal entities and have no obligation to pay any amounts to us, whether by dividends, distributions, loans or other payments. The ability of our subsidiaries to pay dividends or make distributions to us and, accordingly, our ability to pay dividends on Alliant Energy common stock will depend on regulatory limitations, and the earnings, cash flows, capital requirements and general financial condition of our subsidiaries. Our utilities each have dividend payment restrictions based on the terms of any outstanding preferred stock and regulatory limitations applicable to them. If we do not receive adequate dividends and distributions from our subsidiaries, then we may not be able to make, or may have to reduce, dividend payments on Alliant Energy common stock.

Changes to certain tax elections, tax regulations and future taxable income could negatively impact our financial condition and results of operations - We have significantly reduced our federal and state income tax obligations forover the past few years through tax planning strategies.strategies and the extension of bonus depreciation deductions for certain expenditures for property. These tax planning strategies and extensions of bonus depreciation deductions have generated large annual taxable losses and tax credits over the past few years that have resulted in significant federal and state net operating losses and federal tax credit carryforwards. We plan to utilize these net operating losses and tax credit carryforwards in the future to reduce our income tax obligations. If we cannot generate enough taxable income in the future to utilize all of the net operating losses and tax credit carryforwards before they expire due to lower than expected financial performance or changes to tax regulations, we may incur material charges to earnings. If the IRS does not agree with the deductions resulting from our tax planning strategies or our position on the qualification of production tax credits from planned and potential wind generating facilities, our financial condition and results of operations may be adversely impacted.

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Our utility business currently operates wind generating facilities, which generate material production tax credits for us to use to reduce our federal tax obligations. The amount of production tax credits we earn is dependent on the level of electricity output generated by our wind projectsfarms and the applicable tax credit rate. A variety of operating and economic parameters, including significant transmission constraints, adverse weather conditions and breakdown or failure of equipment, could significantly reduce the production tax credits generated by our wind projectsfarms resulting in a material adverse impact on our financial condition and results of operations.

In addition, we have tax benefit riders in place in Iowa that provide billing credits to our customers. We have made certain assumptions regarding the timing of the tax benefit riders for accounting purposes. If those assumptions are not accurate, our results of operations and financial condition may be adversely impacted.

Lastly,
Also, if corporate tax rates or policies are changed with future federal or state legislation, we may be required to take material charges against earnings. For example, the new presidential administration has called for substantial change to fiscal and tax policies, which may include comprehensive tax reform. We are currently unable to determine what impacts these changes will have on our future financial condition or results of operations, including related impacts to IPL’s and WPL’s retail and wholesale electric and gas rates charged to their customers. However, it is possible that these changes could reduce corporate income tax rates, alter tax depreciation lives and methods, disallow deductions for net interest expense, and impede our ability to fully utilize our net operating loss and credit carryforwards.

Finally, FERC regulates utility income tax policies, including partnership tax policies, which impact our investment in ATC. FERC is currently investigating these income tax policies in addition to rate of return policies as a result of a recent court decision. The results of this investigation may lead to changes in FERC’s income tax policies, which would impact partnership entities, particularly our investment in ATC. We are currently unable to determine what impacts these potential changes will have on our future financial condition or results of operations, however, it is possible that a change could reduce Alliant Energy’s equity earnings and distributions from ATC.

Poor performance ofOur pension and other postretirement plan investmentsbenefits plans are subject to investment and interest rate risk that could negatively impact our financial condition - We have pension and other postretirement benefits plans that provide benefits to a large portionmany of our employees and retirees. Costs of providing benefits and related funding requirements of these plans are subject to changes in the market value of the assets that fund the plans. The funded status of the plans and the related costs reflected in our financial statements are affected by various factors, which are subject to an inherent degree of uncertainty, including economic conditions, financial market performance, interest rates, life expectancies and demographics. Recessions and volatility in the domestic and international financial markets have negatively affected the asset values of our pension plans at various times in the past. Future losses of asset valuesPoor investment returns or lower interest rates may necessitate accelerated funding of the plans in the future to meet minimum federal government requirements. Downward pressurerequirements, which could have an adverse impact on the asset valuesour financial condition and results of operations.

We face risks related to non-regulated operations - We rely on our non-regulated operations for a portion of our pension plans may require us to fund obligations earlier than originally planned, which would have anearnings. If our non-regulated investments do not perform at expected levels, we could experience a material adverse impact on our financial condition and results of operations.

Energy industry changes could have a negative effect on our businesses - We operate in a highly regulated business environment. The advent of new and unregulated markets has the potential to significantly impact our financial condition and results of operations. The evolution of the wholesale and transmission markets has the potential to significantly increase costs of transmission, costs associated with inefficient generation dispatching, costs of participation in the new markets and costs stemming from estimated payment settlements. Competitive pressures, including advances in technology that reduce the costs of alternative methods of producing electric energy to a level that is competitive with that of current electric production methods, could result in our utilities losing market share and customers and incurring stranded costs (i.e., assets and other costs rendered unrecoverable through customer rates as a result of competitive pricing)rates), which wouldcould be borne by our shareowners. Further, competitors may not be subject to the same operating, regulatory and financial requirements that we are, potentially causing a substantial competitive disadvantage for us. Changes in technology could also alter the channels through which electric customers buy or utilize power, which could reduce the revenues or increase the expenses of our utility companies. Increased competition from any restructuring efforts in our primary retail electric service territories may have a significant adverse impact on our financial condition and results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.


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ITEM 2. PROPERTIES
Alliant Energy - As a holding company, Alliant Energy doesn’t directly own any significant properties other than the stock of its subsidiaries. The principal properties of those subsidiaries are as follows:


IPL and WPL
Electric - At December 31, 20142016, IPL’s and WPL’s EGUs by primary fuel type were as follows:
      Primary Nameplate Generating
    In-service Dispatch Capacity Capacity
Name of EGU Location Dates Type (a) in MW in MW (b)
Ottumwa Generating Station (Unit 1) (c) Ottumwa, IA 1981 BL 348
 316
Lansing Generating Station (Unit 4) Lansing, IA 1977 BL 275
 247
M.L. Kapp Generating Station (Unit 2) (d) Clinton, IA 1967 BL 218
 195
Prairie Creek Generating Station (Units 1,3,4) Cedar Rapids, IA 1958-1997 BL 213
 142
Burlington Generating Station (Unit 1) Burlington, IA 1968 BL 212
 194
George Neal Generating Station (Unit 4) (e) Sioux City, IA 1979 BL 179
 159
George Neal Generating Station (Unit 3) (f) Sioux City, IA 1975 BL 164
 134
Louisa Generating Station (Unit 1) (g) Louisa, IA 1983 BL 32
 29
Total Coal       1,641
 1,416
           
Emery Generating Station (Units 1-3) Mason City, IA 2004 IN 603
 499
Sutherland Generating Station (Units 1,3) (d) Marshalltown, IA 1955-1961 IN 119
 84
Fox Lake Generating Station (Units 1,3) (d) Sherburn, MN 1950-1962 IN 93
 83
Burlington Combustion Turbines (Units 1-4) (d) Burlington, IA 1994-1996 PK 79
 60
Dubuque Generating Station (Units 3-4) (d) Dubuque, IA 1952-1959 IN 66
 59
Grinnell Combustion Turbines (Units 1-2) (d) Grinnell, IA 1990-1991 PK 48
 38
Red Cedar Combustion Turbine (Unit 1) Cedar Rapids, IA 1996 PK 23
 6
Total Gas       1,031
 829
           
Marshalltown Combustion Turbines (Units 1-3) Marshalltown, IA 1978 PK 189
 140
Lime Creek Combustion Turbines (Units 1-2) Mason City, IA 1991 PK 90
 60
Centerville Combustion Turbines (Units 1-2) (d) Centerville, IA 1990 PK 54
 45
Diesel Stations (7 Units) (d) Iowa and Minnesota 1963-1996 PK 14
 8
Total Oil       347
 253
           
Whispering Willow - East (121 Units) (h) Franklin Co., IA 2009 IN 200
 
Total Wind       200
 
           
Total capacity       3,219
 2,498
IPL Expected   Primary Nameplate Generating
  Retirement or In-service Dispatch Capacity Capacity
Name of EGU and Location Fuel Switch (a) Dates Type (b) in MW in MW (c)
Emery Generating Station (Units 1-3); Mason City, IA N/A 2004 IN 603
 527
M.L. Kapp Generating Station (Unit 2); Clinton, IA N/A 1967 IN 218
 92
Sutherland Generating Station (Units 1,3); Marshalltown, IA Retire by 6/30/17 (d) 1955-1961 IN 119
 99
Fox Lake Generating Station (Units 1,3); Sherburn, MN Retire by 12/31/17 1950-1962 IN 93
 83
Burlington Combustion Turbines (Units 1-4); Burlington, IA Retire by 12/31/17 1994-1996 PK 79
 51
Dubuque Generating Station (Units 3-4); Dubuque, IA Retire by 6/30/17 (d) 1952-1959 IN 66
 59
Grinnell Combustion Turbines (Units 1-2); Grinnell, IA Retire by 12/31/17 1990-1991 PK 48
 36
Red Cedar Combustion Turbine (Unit 1); Cedar Rapids, IA Retire by 12/31/18 1996 PK 23
 11
Total Gas       1,249
 958
           
Ottumwa Generating Station (Unit 1); Ottumwa, IA (e) N/A 1981 BL 348
 326
Lansing Generating Station (Unit 4); Lansing, IA N/A 1977 BL 275
 235
Prairie Creek Generating Station (Units 1,3,4); Cedar Rapids, IA Units 1 and 3 - fuel switch or retire by 12/31/25; Unit 4 - fuel switch by 12/31/17 (d) 1958-1997 BL 213
 147
Burlington Generating Station (Unit 1); Burlington, IA Fuel switch by 12/31/21 (d) 1968 BL 212
 203
George Neal Generating Station (Unit 4); Sioux City, IA (f) N/A 1979 BL 179
 160
George Neal Generating Station (Unit 3); Sioux City, IA (g) N/A 1975 BL 164
 131
Louisa Generating Station (Unit 1); Louisa, IA (h) N/A 1983 BL 32
 29
Total Coal       1,423
 1,231
           
Marshalltown Combustion Turbines (Units 1-3); Marshalltown, IA Fuel switch by 12/31/17 1978 PK 189
 139
Lime Creek Combustion Turbines (Units 1-2); Mason City, IA N/A 1991 PK 90
 69
Centerville Combustion Turbines (Units 1-2); Centerville, IA Retire by 12/31/17 1990 PK 54
 47
Diesel Stations (5 Units); Iowa (i) Retire by 12/31/17 1963-1966 PK 10
 
Total Oil       343
 255
           
Whispering Willow - East (121 Units); Franklin Co., IA N/A 2009 IN 200
 33
Total Wind       200
 33
           
Total capacity       3,215
 2,477
WPL     Primary Nameplate Generating
    In-service Dispatch Capacity Capacity
Name of EGU and Location Expected Retirement (a) Dates Type (b) in MW in MW (c)
Riverside Energy Center (Units 1-3); Beloit, WI N/A 2004 IN 675
 539
Neenah Energy Facility (Units 1-2); Neenah, WI N/A 2000 PK 371
 283
South Fond du Lac Combustion Turbines (2 Units); Fond du Lac, WI (j) N/A 1994 PK 191
 146
Rock River Combustion Turbines (Units 3-6); Beloit, WI Retire by 12/31/20 1967-1972 PK 169
 122
Sheepskin Combustion Turbine (Unit 1); Edgerton, WI Retire by 12/31/20 1971 PK 42
 35
Total Gas       1,448
 1,125
           
Columbia Energy Center (Units 1-2); Portage, WI (k) N/A 1975-1978 BL 514
 495
Edgewater Generating Station (Unit 5); Sheboygan, WI N/A 1985 BL 414
 399
Edgewater Generating Station (Unit 4); Sheboygan, WI (l) Retire by 12/31/18 (d) 1969 BL 239
 191
Total Coal       1,167
 1,085
           
Bent Tree (122 Units); Freeborn Co., MN N/A 2010-2011 IN 201
 32
Cedar Ridge (41 Units); Fond du Lac Co., WI N/A 2008 IN 68
 9
Total Wind       269
 41
           
Prairie du Sac Hydro Plant (8 Units); Prairie due Sac, WI N/A 1914-1940 IN 32
 12
Kilbourn Hydro Plant (4 Units); Wisconsin Dells, WI N/A 1926-1939 IN 10
 6
Total Hydro       42
 18
           
Total capacity       2,926
 2,269


(a)Expected dates for the retirement and fuel switching of these EGUs are subject to change depending on operational, regulatory, market and other factors. The potential retirement of other EGUs within the generation fleet continues to be evaluated. IPL and WPL are working with MISO, state regulatory commissions and other regulatory agencies, as required, to determine the final timing of certain of these actions. Final MISO studies could indicate that the retirement of an individual EGU may result in reliability issues and that transmission network upgrades for system reliability are necessary to enable such retirement. Under the current MISO tariff, the specific timing for the retirement of these EGUs could depend on the timing of the required transmission network upgrades as well as various operational, market and other factors.
(b)Base load EGUs (BL) are designed for nearly continuous operation at or near full capacity to provide the system base load. Intermediate EGUs (IN) follow system load changes with frequent starts and curtailments of output during low demand. Peak load EGUs (PK) are generally low efficiency, quick response units that run primarily when there is high demand.
(b)(c)
Based on the accredited generating capacity of the EGUs included in MISO’s resource adequacy process for the planning period from June 20142016 through May 20152017.
(c)(d)
Actions and plans for retirement or fuel switch meet requirements specified in IPL’s and WPL’s respective Consent Decree, which are discussed in Note 16(e).
(e)Represents IPL’s 48% ownership interest in this 726 MW (nameplate capacity) / 659680 MW (generating capacity) EGU, which is operated by IPL.
(d)
Refer to “Strategic Overview” in MDA for discussion of EGUs that may be retired or changed from coal-fired to an alternative fuel source in the next few years.
(e)(f)Represents IPL’s 25.695% ownership interest in this 696 MW (nameplate capacity) / 620 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.
(f)Represents IPL’s 28% ownership interest in this 584 MW (nameplate capacity) / 479622 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.
(g)Represents IPL’s 4%28% ownership interest in this 812584 MW (nameplate capacity) / 728466 MW (generating capacity) EGU, which is operated by MidAmerican Energy Company.

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(h)Generating capacity represents 0% of the capacity ofRepresents IPL’s 4% ownership interest in this wind project based upon the MISO resource adequacy process,812 MW (nameplate capacity) / 725 MW (generating capacity) EGU, which is determined separately for each wind site, during the planning period from June 2014 through May 2015. The 0% allocation resulted from the lack of firm transmission at this wind site during the planning period from June 2014 through May 2015.

At December 31, 2014, IPL owned approximately 19,642 miles of overhead electric distribution line and 2,961 miles of underground electric distribution cable, as well as 696 substation distribution transformers, substantially all of which are located in Iowa and Minnesota.

Gas - IPL’s gas properties consist primarily of mains and services, meters, regulating and gate stations and other related transmission and distribution equipment. At December 31, 2014, IPL’s gas distribution facilities included approximately 5,088 miles and 237 miles of gas mains located in Iowa and Minnesota, respectively.

Other - IPL’s other property consists primarily of steam service assets, operating and storeroom facilities, vehicles, computer hardware and software, communication equipment and other miscellaneous tools and equipment.

WPL
Electric - At December 31, 2014, WPL’s EGUs by primary fuel type were as follows:
      Primary Nameplate Generating
    In-service Dispatch Capacity Capacity
Name of EGU Location Dates Type (a) in MW in MW (b)
Columbia Energy Center (Units 1-2) (c) Portage, WI 1975-1978 BL 514
 494
Edgewater Generating Station (Unit 5) Sheboygan, WI 1985 BL 414
 406
Edgewater Generating Station (Unit 4) (d) (e) Sheboygan, WI 1969 BL 239
 199
Nelson Dewey Generating Station (Units 1-2) (e) Cassville, WI 1959-1962 BL 227
 202
Edgewater Generating Station (Unit 3) (e) Sheboygan, WI 1951 IN 69
 69
Total Coal       1,463
 1,370
           
Riverside Energy Center (Units 1-3) Beloit, WI 2004 IN 675
 545
Neenah Energy Facility (Units 1-2) Neenah, WI 2000 PK 371
 281
South Fond du Lac Combustion Turbines (2 Units) (f) Fond du Lac, WI 1994 PK 191
 143
Rock River Combustion Turbines (Units 3-6) (e) (g) Beloit, WI 1967-1972 PK 169
 88
Sheepskin Combustion Turbine (Unit 1) (e) Edgerton, WI 1971 PK 42
 35
Total Gas       1,448
 1,092
           
Bent Tree (122 Units) (h) Freeborn Co., MN 2010-2011 IN 201
 
Cedar Ridge (41 Units) (i) Fond du Lac Co., WI 2008 IN 68
 8
Total Wind       269
 8
           
Prairie du Sac Hydro Plant (8 Units) Prairie du Sac, WI 1914-1940 IN 31
 12
Kilbourn Hydro Plant (4 Units) Wisconsin Dells, WI 1926-1939 IN 10
 6
Total Hydro       41
 18
           
Total capacity       3,221
 2,488

(a)BL are designed for nearly continuous operation at or near full capacity to provide the system base load. IN follow system load changes with frequent starts and curtailments of output during low demand. PK are generally low efficiency, quick response units that run primarily when there is high demand.operated by MidAmerican Energy Company.
(b)(i)Based on theThese EGUs did not receive any accredited generating capacity of the EGUs included in MISO’s resource adequacy process for the planning period from June 20142016 through May 2015.2017.
(c)(j)Represents Units 2 and 3, which WPL owns. WPL also operates, but does not own, South Fond du Lac Combustion Turbines Units 1 and 4.
(k)Represents WPL’s 46.2% ownership interest in this 1,112 MW (nameplate capacity) / 1,0701,072 MW (generating capacity) EGU, which is operated by WPL.
(d)(l)Represents WPL’s 68.2% ownership interest in this 351 MW (nameplate capacity) / 292280 MW (generating capacity) EGU, which is operated by WPL.
(e)
Refer to “Strategic Overview” in MDA for discussion of EGUs that may be retired in the next few years.
(f)Represents Units 2 and 3, which WPL owns. WPL also operates South Fond du Lac Combustion Turbines Units 1 and 4.

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(g)Rock River Combustion Turbine Unit 6 was not operating during the testing period for MISO’s resource adequacy process for the planning period from June 2014 through May 2015, resulting in no capacity being accredited to the EGU for that planning period.
(h)Generating capacity represents 0% of the capacity of this wind project based upon the MISO resource adequacy process, which is determined separately for each wind site, during the planning period from June 2014 through May 2015. The 0% allocation resulted from the lack of firm transmission at this wind site during the planning period from June 2014 through May 2015.
(i)
Generating capacity represents 12% of the capacity of this wind project based upon the MISO resource adequacy process, which is determined separately for each wind site, during the planning period from June 2014 through May 2015.

At December 31, 2014, WPL2016, IPL owned approximately 16,34017,485 miles of overhead electric distribution line and 5,1982,977 miles of underground electric distribution cable, as well as 303564 substation distribution transformers, substantially all of which are located in Iowa. At December 31, 2016, WPL owned approximately 16,222 miles of overhead electric distribution line and 5,481 miles of underground electric distribution cable, as well as 302 substation distribution transformers, substantially all of which are located in Wisconsin.

Gas - IPL’s and WPL’s gas properties consist primarily of mains and services, meters, regulating and gate stations and other related transmission and distribution equipment. At December 31, 20142016, WPL’sIPL’s gas distribution facilities included approximately 4,1955,116 miles of gas mains located in Iowa and WPL’s included approximately 4,430 miles of gas mains located in Wisconsin.

Other - Refer to Note 10(b) for information regarding WPL’s lease of Sheboygan Falls from Resources’ Non-regulated Generation business.IPL’s and WPL’s other property consists primarily of operating and storeroom facilities, vehicles, computer hardware and software, communication equipment and other miscellaneous tools and equipment. IPL’s other property also includes steam service assets. Refer to Note 10(b) for information regarding WPL’s lease of Sheboygan Falls from AEF’s Non-regulated Generation business.

ResourcesAEF - Resources’AEF’s principal properties included in “Property, plant and equipment, net” on Alliant Energy’s balance sheet at December 31, 20142016 were as follows:

Non-regulated Generation - Includes Sheboygan Falls, a 347 MW, simple-cycle, natural gas-fired facility near Sheboygan Falls, Wisconsin that was placed in service in 2005 and is leased to WPL, and the 99 MW (60 Units) Franklin County wind projectfarm in Franklin County, Iowa that was placed in service in 2012. Sheboygan Falls wasand Franklin County wind farm were accredited with 280281 MW and 17 MW, respectively, of generating capacity for MISO’s resource adequacy process for the planning period from June 20142016 through May 2015.2017.


Transportation - Includes a short-line railway in Iowa with 114 miles of railroad track, 1210 active locomotives and 7212 rail-cars; and a barge terminal on the Mississippi River; and a coal terminal in Williams, Iowa.

Other non-regulated investments - Includes two corporate airplanes and real estate investments.River.

Corporate Services - Corporate Services’ property included in “Property, plant and equipment, net” on Alliant Energy’s balance sheet at December 31, 20142016 consisted primarily of a customer billing and information system for IPL and WPL and other computer software, and the corporate headquarters building located in Madison, Wisconsin. Corporate Services is also implementing a new customer billing and information system for IPL and WPL, which is currently expected to be deployed in 2015.

ITEM 3. LEGAL PROCEEDINGS

Alliant Energy - None.

IPL - None.

WPL - None.

Other- Alliant Energy, IPL and WPL are involved in legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business. Although unable to predict the outcome of these matters, Alliant Energy, IPL and WPL believe that final disposition of these actions will not have a material effect on their financial condition or results of operations.

ITEM 4. MINE SAFETY DISCLOSURES

None.


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EXECUTIVE OFFICERS OF THE REGISTRANTS
None of the executive officers for Alliant Energy, IPL or WPL listed below are related to any member of the Board of Directors or nominee for director or any other executive officer. All of the executive officers have no definite terms of office and serve at the pleasure of the Board of Directors. The executive officers of Alliant Energy, IPL and WPL as of the date of this filing are as follows (numbers following the names represent the officer’s age as of the date of this filing):

Executive Officers of Alliant Energy
Patricia L. Kampling, 55, has served as a director since January 2012, and as Chairman of the Board, President and CEO since April 2012. She previously served as President and Chief Operating Officer since February 2011, as EVP and CFO from September 2010 to February 2011, and as EVP-CFO and Treasurer from January 2010 to September 2010.
James H. Gallegos, 54, was elected Senior VP, General Counsel and Corporate Secretary effective February 2015. He previously served as Senior VP and General Counsel since February 2014, as VP and General Counsel from November 2010 to February 2014, and as VP and Corporate General Counsel of BNSF Railway Company, a subsidiary of Burlington Northern and Santa Fe Corporation, from April 2003 to April 2010.
Patricia L. Kampling57Ms. Kampling has served as a director since January 2012, and as Chairman of the Board, President and Chief Executive Officer (CEO) since April 2012. She previously served as President and Chief Operating Officer since February 2011.
James H. Gallegos56Mr. Gallegos has served as Senior Vice President (VP), General Counsel and Corporate Secretary since February 2015. He previously served as Senior VP and General Counsel since February 2014 and as VP and General Counsel from November 2010 to February 2014.
Douglas R. Kopp63Mr. Kopp has served as Senior VP since March 2014. He previously served as VP-Environmental Affairs since January 2013 and as Director-Environmental Affairs from January 2011 to January 2013.
John O. Larsen53Mr. Larsen has served as Senior VP since February 2014. He previously served as Senior VP-Generation since January 2010.
Wayne A. Reschke61Mr. Reschke has served as Senior VP since February 2016. He previously served as VP since February 2014 and as VP-Human Resources from September 2009 to February 2014.
Robert J. Durian46Mr. Durian has served as VP, Chief Financial Officer (CFO) and Treasurer since December 2016. He previously served as VP, Chief Accounting Officer (CAO) and Treasurer since July 2016; VP, CAO and Controller from July 2015 to July 2016; and as Controller and CAO from February 2011 to July 2015.
Benjamin M. Bilitz42Mr. Bilitz has served as CAO and Controller since December 2016. He previously served as Controller since July 2016 and as Assistant Controller from March 2011 to July 2016.
Thomas L. Hanson, 61, was elected Senior VP and CFO effective January 2013. He previously served as VP and CFO since May 2011, as VP-CFO and Treasurer from February 2011 to May 2011, as VP-CAO and Treasurer from September 2010 to February 2011, and as VP-Controller and CAO from January 2007 to September 2010.
Douglas R. Kopp, 61, was elected Senior VP effective March 2014. He previously served as VP-Environmental Affairs since January 2013, as Director-Environmental Affairs from January 2011 to January 2013, as Plant Manager of the Prairie Creek Generating Station from September 2010 to January 2011, and as Plant Manager of the Sutherland Generating Station from May 2009 to September 2010.
John O. Larsen, 51, was elected Senior VP effective February 2014. He previously served as Senior VP-Generation since January 2010.
Robert J. Durian, 44, was elected Controller and CAO effective February 2011. He previously served as Controller since September 2010, and as Assistant Controller from March 2009 to September 2010.

Executive Officers of IPL
Patricia L. Kampling, 55, has served as a director since January 2012, and as Chairman of the Board and CEO since April 2012.
Douglas R. Kopp, 61, was elected Senior VP effective March 2014 and President effective April 2014.
James H. Gallegos, 54, was elected Senior VP, General Counsel and Corporate Secretary effective February 2015.
Thomas L. Hanson, 61, was elected Senior VP and CFO effective January 2013.
John O. Larsen, 51, was elected Senior VP effective February 2014.
Robert J. Durian, 44, was elected Controller and CAO effective February 2011.
Patricia L. Kampling57Ms. Kampling has served as a director since January 2012, and as Chairman of the Board and CEO since April 2012.
Douglas R. Kopp63Mr. Kopp has served as President since April 2014.
James H. Gallegos56Mr. Gallegos has served as Senior VP, General Counsel and Corporate Secretary since February 2015.
John O. Larsen53Mr. Larsen has served as Senior VP since February 2014.
Wayne A. Reschke61Mr. Reschke has served as Senior VP since February 2016.
Robert J. Durian46Mr. Durian has served as VP, CFO and Treasurer since December 2016.
Benjamin M. Bilitz42Mr. Bilitz has served as CAO and Controller since December 2016.

Executive Officers of WPL
Patricia L. Kampling, 55, has served as a director since January 2012, and as Chairman of the Board and CEO since April 2012.
John O. Larsen, 51, was elected President effective December 2010.
James H. Gallegos, 54, was elected Senior VP, General Counsel and Corporate Secretary effective February 2015.
Thomas L. Hanson, 61, was elected Senior VP and CFO effective January 2013.
Douglas R. Kopp, 61, was elected Senior VP effective March 2014.
Robert J. Durian, 44, was elected Controller and CAO effective February 2011.
Patricia L. Kampling57Ms. Kampling has served as a director since January 2012, and as Chairman of the Board and CEO since April 2012.
John O. Larsen53Mr. Larsen has served as President since December 2010.
James H. Gallegos56Mr. Gallegos has served as Senior VP, General Counsel and Corporate Secretary since February 2015.
Douglas R. Kopp63Mr. Kopp has served as Senior VP since March 2014.
Wayne A. Reschke61Mr. Reschke has served as Senior VP since February 2016.
Robert J. Durian46Mr. Durian has served as VP, CFO and Treasurer since December 2016.
Benjamin M. Bilitz42Mr. Bilitz has served as CAO and Controller since December 2016.


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PART II

ITEM 5. MARKET FOR REGISTRANTS’ COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Stock Price - Alliant Energy’s common stock trades on the New York Stock Exchange under the symbol “LNT.” Quarterly sales price high and low ranges and dividends with respect to Alliant Energy’s common stock were as follows:follows. Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.
  2014 2013
Quarter High Low Dividend High Low Dividend
First 
$56.99
 
$50.00
 
$0.51
 
$50.23
 
$43.73
 
$0.47
Second 60.88
 55.47
 0.51
 53.52
 46.79
 0.47
Third 60.89
 54.69
 0.51
 54.18
 48.17
 0.47
Fourth 69.78
 55.38
 0.51
 53.69
 48.83
 0.47
Year 69.78
 50.00
 2.04
 54.18
 43.73
 1.88

Stock closingClosing sales price at December 31, 20142016: $66.42$37.89

Shareowners - At December 31, 20142016, there were 29,49327,287 holders of record of Alliant Energy’s common stock, including holders through Alliant Energy’s Shareowner Direct Plan. Alliant Energy is the sole common shareowner of all 13,370,788 and 13,236,601 shares of IPL and WPL common stock, respectively, currently outstanding. As a result, there is no established public trading market for the common stock of either IPL or WPL.

Dividends - In November 2014,2016, Alliant Energy announced an increase in its targeted 20152017 annual common stock dividend to $2.20$1.26 per share, which is equivalent to a quarterly rate of $0.55$0.315 per share, beginning with the February 20152017 dividend payment. The timing and amount of future dividends is subject to an approved dividend declaration from itsAlliant Energy’s Board of Directors, and is dependent upon earnings expectations, capital requirements, and general financial business conditions, among other factors.

Alliant Energy does not have any significant common stock dividend restrictions. Refer to Note 7 for information about IPL’s and WPL’s dividend restrictions and limitations on distributions to their parent company.

Common Stock Repurchases - A summary of Alliant Energy common stock repurchases for the quarter ended December 31, 20142016 was as follows:
 Total Number Average Price Total Number of Shares Maximum Number (or Approximate Total Number Average Price Total Number of Shares Maximum Number (or Approximate
 of Shares Paid Per Purchased as Part of Dollar Value) of Shares That May of Shares Paid Per Purchased as Part of Dollar Value) of Shares That May
Period Purchased (a) Share Publicly Announced Plan Yet Be Purchased Under the Plan (a) Purchased (a) Share Publicly Announced Plan Yet Be Purchased Under the Plan (a)
October 1 to October 31 3,211
 
$56.36
  N/A 3,919
 
$37.22
  N/A
November 1 to November 30 2,036
 61.80
  N/A 3,684
 35.76
  N/A
December 1 to December 31 78
 64.60
  N/A 144
 37.14
  N/A
 5,325
 58.56
   7,747
 36.52
  

(a)All shares were purchased on the open market and held in a rabbi trust under the DCP. There is no limit on the number of shares of Alliant Energy common stock that may be held under the DCP, which currently does not have an expiration date.

Other - Refer to “Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters” in Item 12 for details of securities authorized for issuance under equity compensation plans.


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ITEM 6. SELECTED FINANCIAL DATA

Financial Information
Alliant Energy2014 (a) 2013 (a) 2012 (a) 2011 20102016 (a) 2015 (a) 2014 (a) 2013 2012
(dollars in millions, except per share data)(dollars in millions, except per share data)
Income Statement Data:  
Operating revenues
$3,350.3
 
$3,276.8
 
$3,094.5
 
$3,221.4
 
$3,262.1

$3,320.0
 
$3,253.6
 
$3,350.3
 
$3,276.8
 
$3,094.5
Income from continuing operations, net of tax395.7
 382.1
 340.8
 341.4
 310.2
Loss from discontinued operations, net of tax(2.4) (5.9) (5.1) (19.5) (3.9)
Net income393.3
 376.2
 335.7
 321.9
 306.3
Amounts attributable to Alliant Energy common shareowners:                  
Income from continuing operations, net of tax385.5
 364.2
 324.9
 323.1
 291.5
373.8
 380.7
 385.5
 364.2
 324.9
Loss from discontinued operations, net of tax(2.4) (5.9) (5.1) (19.5) (3.9)(2.3) (2.5) (2.4) (5.9) (5.1)
Net income383.1
 358.3
 319.8
 303.6
 287.6
371.5
 378.2
 383.1
 358.3
 319.8
Common Stock Data:                  
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted):         
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted) (b):         
Income from continuing operations, net of tax
$3.48
 
$3.29
 
$2.93
 
$2.92
 
$2.64

$1.65
 
$1.69
 
$1.74
 
$1.64
 
$1.47
Loss from discontinued operations, net of tax
($0.02) 
($0.06) 
($0.04) 
($0.18) 
($0.04)
($0.01) 
($0.01) 
($0.01) 
($0.02) 
($0.03)
Net income
$3.46
 
$3.23
 
$2.89
 
$2.74
 
$2.60

$1.64
 
$1.68
 
$1.73
 
$1.62
 
$1.44
Common shares outstanding at year-end (000s)110,936
 110,944
 110,987
 111,019
 110,894
Dividends declared per common share
$2.04
 
$1.88
 
$1.80
 
$1.70
 
$1.58
Market value per share at year-end
$66.42
 
$51.60
 
$43.91
 
$44.11
 
$36.77
Book value per share at year-end
$31.00
 
$29.58
 
$28.25
 
$27.14
 
$26.09
Common shares outstanding at year-end (000s) (b)227,674
 226,918
 221,871
 221,887
 221,975
Dividends declared per common share (b)
$1.175
 
$1.10
 
$1.02
 
$0.94
 
$0.90
Market value per share at year-end (b)
$37.89
 
$31.225
 
$33.21
 
$25.80
 
$21.955
Book value per share at year-end (b)
$16.96
 
$16.41
 
$15.50
 
$14.79
 
$14.12
Market capitalization at year-end
$7,368.4
 
$5,724.7
 
$4,873.4
 
$4,897.0
 
$4,077.6

$8,626.6
 
$7,085.5
 
$7,368.3
 
$5,724.7
 
$4,873.5
Other Selected Financial Data:                  
Cash flows from operating activities
$891.6
 
$731.0
 
$841.1
 
$702.7
 
$984.9

$859.6
 
$871.2
 
$891.6
 
$731.0
 
$841.1
Construction and acquisition expenditures
$902.8
 
$798.3
 
$1,158.1
 
$673.4
 
$866.9

$1,196.8
 
$1,034.3
 
$902.8
 
$798.3
 
$1,158.1
Total assets at year-end
$12,085.9
 
$11,112.4
 
$10,785.5
 
$9,687.9
 
$9,282.9

$13,373.8
 
$12,495.2
 
$12,063.5
 
$11,092.5
 
$10,766.0
Long-term obligations, net
$3,791.1
 
$3,338.1
 
$3,141.5
 
$2,708.0
 
$2,710.3

$4,325.1
 
$3,837.0
 
$3,768.7
 
$3,318.2
 
$3,122.0
Times interest earned before income taxes (b)3.44X
 3.52X
 3.75X
 3.59X
 3.81X
Capitalization ratios:         
Common equity45% 46% 47% 50% 49%
Preferred stock of subsidiaries3% 3% 3% 3% 4%
Long- and short-term debt52% 51% 50% 47% 47%
Total100% 100% 100% 100% 100%
IPL         
Operating revenues
$1,820.4
 
$1,774.5
 
$1,848.1
 
$1,818.8
 
$1,650.3
Earnings available for common stock215.6
 186.0
 181.6
 172.0
 145.7
Cash dividends declared on common stock151.9
 140.0
 140.0
 128.1
 122.9
Cash flows from operating activities361.9
 385.0
 406.1
 232.6
 291.0
Total assets7,304.7
 6,709.1
 6,450.2
 5,793.9
 5,446.8
Long-term obligations, net2,154.0
 1,857.4
 1,758.6
 1,549.5
 1,353.7
          
WPL         
Operating revenues
$1,459.1
 
$1,435.1
 
$1,449.1
 
$1,406.3
 
$1,392.0
Earnings available for common stock190.4
 176.3
 180.4
 177.5
 169.4
Cash dividends declared on common stock135.0
 126.9
 118.7
 116.3
 112.0
Cash flows from operating activities521.4
 449.8
 424.4
 423.3
 427.4
Total assets5,290.3
 5,270.4
 5,117.6
 4,796.2
 4,754.4
Long-term obligations, net1,623.2
 1,624.2
 1,658.3
 1,423.2
 1,426.3

(a)
Refer to “Alliant Energy’s Results of Operations” in MDA for discussion of the 2014, 20132016, 2015 and 20122014 results of operations.
(b)Represents
Amounts reflect the sumeffects of income from continuing operations before income taxes plus interest expense, divided by interest expense.


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IPL2014 (a) 2013 (a) 2012 (a) 2011 2010
 (in millions)
Operating revenues
$1,848.1
 
$1,818.8
 
$1,650.3
 
$1,740.1
 
$1,795.8
Net income194.6
 189.9
 150.2
 139.3
 143.4
Earnings available for common stock184.4
 173.6
 137.6
 124.3
 128.0
Cash dividends declared on common stock140.0
 128.1
 122.9
 73.4
 
Cash flows from operating activities406.1
 232.6
 291.0
 366.9
 549.6
Total assets6,461.8
 5,806.0
 5,457.0
 5,093.5
 4,937.6
Long-term obligations, net1,769.3
 1,559.2
 1,361.7
 1,311.0
 1,310.6

(a)
a two-for-one common stock split distributed in May 2016. Refer to IPL’s Results of OperationsNote 7” in MDA for a discussion of the 2014, 2013 and 2012 results of operations.additional details.

Alliant Energy is the sole common shareowner of all 13,370,788 and 13,236,601 shares of IPL’s and WPL’s common stock outstanding.outstanding, respectively. As such, earnings per share data is not disclosed herein.herein for IPL and WPL.

WPL2014 (a) 2013 (a) 2012 (a) 2011 2010
 (in millions)
Operating revenues
$1,449.1
 
$1,406.3
 
$1,392.0
 
$1,434.4
 
$1,423.6
Net income180.8
 177.5
 165.7
 163.5
 152.3
Earnings available for common stock180.1
 175.9
 162.4
 160.2
 149.0
Cash dividends declared on common stock118.7
 116.3
 112.0
 112.1
 109.5
Cash flows from operating activities424.4
 423.3
 427.4
 428.8
 372.4
Total assets5,128.2
 4,804.4
 4,762.6
 4,044.0
 3,889.6
Long-term obligations, net1,669.1
 1,432.2
 1,436.1
 1,190.7
 1,193.7

(a)
Refer to “WPL’s Results of Operations” in MDA for a discussion of the 2014, 2013 and 2012 results of operations.

Alliant Energy is the sole common shareowner of all 13,236,601 shares of WPL’s common stock outstanding. As such, earnings per share data is not disclosed herein.

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This MDA includes information relating to Alliant Energy, IPL and WPL, as well as ResourcesAEF and Corporate Services. Where appropriate, information relating to a specific entity has been segregated and labeled as such. The following discussion and analysis should be read in conjunction with the Financial Statements and Notes included in this report. Unless otherwise noted, all “per share” references in MDA refer to earnings per diluted share.

CONTENTS OF MDA

Alliant Energy’s, IPL’s and WPL’s MDA consists of the following information:

Executive Summary


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EXECUTIVE SUMMARYOVERVIEW

Description of Business
General - Alliant Energy is an investor-owned public utility holding company whose primary subsidiaries are IPL, WPL, ResourcesAEF and Corporate Services. IPL is aand WPL are public utility engaged principally in the generationutilities, and distribution of electricity and the distribution and transportation of natural gas in select markets in Iowa and southern Minnesota. WPL is a public utility engaged principally in the generation and distribution of electricity and the distribution and transportation of natural gas in select markets in southern and central Wisconsin. At December 31, 2014, WPL and Resources, through their ownership interests in WPL Transco, in aggregate held an approximate 16% ownership interest in ATC, a transmission-only utility operating primarily in the Midwest. ResourcesAEF is the parent company for Alliant Energy’s non-regulated businesses.businesses and holds all of Alliant Energy’s investment in ATC. Corporate Services provides administrative services to Alliant Energy and its subsidiaries. An illustration of Alliant Energy’s primary businesses is shown below.
  Alliant Energy  
      
     
Utilities, ATC and Corporate Services Non-regulated and Parent
 - ElectricRetail electric and gas services in IA (IPL)  - Transportation (Resources)(AEF)
 - ElectricRetail electric and gas services in WI (WPL)  - Non-regulated Generation (Resources)(AEF)
 - 16% interest in ATC (primarily WPL)(ATI) (a)  - Parent Company
 - Electric and gas servicesWholesale electric service in MN, IL & IA (IPL) (a)
 - Wholesale electric service in WI (WPL)  
 - Corporate Services 

(a)
In September 2013, IPL signed definitive agreements to sell its Minnesota electric and natural gas distribution assets. Refer to Note 3 for further discussionAt December 31, 2016, ATI, a wholly-owned subsidiary of these anticipated sales.
AEF, holds all of Alliant Energy’s investment in ATC, a transmission-only utility operating primarily in the Midwest.

Utilities, ATC and Corporate Services - IPL and WPL own a portfolio of EGUs located in Iowa, Wisconsin and Minnesota with a diversified fuel mix including coal, natural gas, renewable resources and renewable resources.coal. The output from these EGUs, supplemented with purchased power, is used to provide electric service to approximately 1 million960,000 electric customers in the upper Midwest. The utility business also procures natural gas from various suppliers to provide service to approximately 420,000410,000 retail gas customers in the upper Midwest. Alliant Energy’s utility business is its primary source of earnings and cash flows. The earnings and cash flows from the utilities, ATC and Corporate Services business are sensitive to various external factors including, but not limited to, the amount and timing of rates approved by regulatory authorities, the impact of weather and economic conditions on electric and gas sales volumes and other factors listed in “Risk Factors” in Item 1A and “Forward-looking Statements.”

Non-regulated Business and Parent - ResourcesAEF manages various businesses including Non-regulated Generation (EGU management)(Sheboygan Falls and the Franklin County wind farm), Transportation (short-line railway and barge transportation services) and several other modest investments. Parent includes the operations of Alliant Energy (parent holding company).

Financial Results - Details regarding Alliant Energy’s net income and EPS attributable to Alliant Energy common shareowners were as follows (dollars in millions, except per share amount)amounts):
2014 20132016 2015
Net Income EPS Net Income EPSIncome (Loss) EPS (a) Income (Loss) EPS (a)
Continuing operations:              
Utilities and Corporate Services
$373.3
 
$3.37
 
$356.5
 
$3.22
Utilities, ATC and Corporate Services
$420.4
 
$1.85
 
$374.5
 
$1.66
Non-regulated and Parent12.2
 0.11
 7.7
 0.07
(46.6) (0.20) 6.2
 0.03
Income from continuing operations385.5
 3.48
 364.2
 3.29
373.8
 1.65
 380.7
 1.69
Loss from discontinued operations(2.4) (0.02) (5.9) (0.06)(2.3) (0.01) (2.5) (0.01)
Net income
$383.1
 
$3.46
 
$358.3
 
$3.23

$371.5
 
$1.64
 
$378.2
 
$1.68

(a) Amounts reflect the effects of a two-for-one stock split distributed in May 2016. Refer to Note 7 for additional details.

The table above includes EPS from continuing operations for utilities, ATC and Corporate Services, and non-regulated and parent, EPS from continuing operations, which are non-GAAP financial measures. Alliant Energy believes EPS from continuing operations for utilities, ATC

and Corporate Services, and non-regulated and parent EPS from continuing operations are useful to investors because they facilitate an understanding of segment performance and trends and provide additional information about Alliant Energy’s operations on a basis consistent with the measures that management uses to manage its operations and evaluate its performance. Alliant Energy’s management also uses utilities and Corporate Services EPS from continuing operations to determine performance-based compensation.


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UtilitiesLower net income and Corporate Services - Higher EPS from continuing operations in 20142016 compared to 20132015 was primarily due to:
$0.70 per share of lower purchased electric capacity expenseto asset valuation charges related to the previous DAEC PPA recordedFranklin County wind farm in 2014 compared to 2013;
$0.33 per share of purchased electric capacity expense related to the Kewaunee PPA that expired in 2013;
$0.06 per share of lower income tax expense at IPL in 2014 compared to 2013 due to Iowa rate-making practices; and
$0.06 per share of charges related to preferred stock redemptions at IPL and WPL in 2013.

These items were2016, partially offset by:
$0.39 per share of retail electric customer billing credits at IPL in 2014 related to an approved settlement agreement for its Iowa retail electric base rates;
$0.11 per share ofby higher energy efficiency cost recovery amortizations at WPL in 2014 compared to 2013;
$0.08 per share of higher generation, distribution and customer service operation and maintenances expenses in 2014 compared to 2013;
an estimated $0.08 per share of net decreases in revenues from lower electric and gas sales in 2014 compared to 2013 due to weather conditions;
$0.08 per share ofmargins, higher depreciation expense in 2014 compared to 2013;
$0.06 per share of higher interest expense in 2014 compared to 2013;
$0.05 per share from changes in the revenue requirement adjustmentAFUDC (primarily related to certain IPL tax benefitsMarshalltown) and losses on sales of IPL’s Minnesota electric and gas distribution assets in 2014 compared to 2013;
$0.05 per share of higher electric transmission service expense, net of recoveries, in 2014 compared to 2013; and
$0.05 per share of lower electric margins related to changes in the recovery of fuel-related expense at WPL.2015.

Refer to “Alliant Energy’s Results of Operations,” “IPL’s Results of Operations” and “WPL’s Results of Operations” for additional details regarding the various factors impacting their respective earnings during 20142016, 20132015 and 20122014.

Strategic 2016Overview Highlights
The - In 2016, Alliant Energy, IPL and WPL focused on achieving financial objectives and executing their strategic plan focuses on the core business of delivering regulated electric and natural gas serviceplan. Key developments in Iowa and Wisconsin, and is built upon three key elements: competitive costs, safe and reliable service, and responsible resources. Key strategic plan developments2016 include the following.following:
IPL’s Expansion of Wind Generation - In October 2016, IPL and the Iowa Office of Consumer Advocate, among other customer groups, filed a settlement agreement with the IUB regarding the appropriate rate-making principles for up to 500 MW of additional wind generation at IPL. In October 2016, the IUB issued an order approving the settlement agreement, with limited modifications, and establishing rate-making principles, which IPL accepted, with key terms as follows. Refer to “Strategic Overview” for further discussion.
Up to 500 MW of additional wind generation that qualifies for the full level of production tax credits, regardless of the location in Iowa, with a cost cap of $1,830/kilowatt, including AFUDC and transmission costs. Any costs incurred in excess of this $1,830/kilowatt cost cap are expected to be incorporated into rates if determined to be reasonable and prudent.
A depreciable life of the wind generation of 40 years, unless changed as a result of a contested case before the IUB.
An 11.0% return on common equity, with the exception of certain transmission facilities classified as intangible assets, which would earn the rate of return on common equity the IUB finds reasonable during a future rate case.
Franklin County Wind Farm - In addition to Strategic Overview” for a more detailed discussionIPL’s expansion of strategic plan developments.wind generation discussed above, in February 2017, FERC issued an order approving the transfer of the 99 MW Franklin County wind farm from AEF to IPL. Alliant Energy and IPL currently expect to complete this transfer in 2017.
January 2014
IPL’s and WPL’s Potential Expansion of Wind Generation -In addition to IPL’s 500 MW expansion of wind generation and transfer of the 99 MW Franklin County wind farm to IPL in 2017 discussed above, IPL and WPL are each exploring options to own and operate up to 200 MW of additional new wind generation.
WPL’s Construction of the Riverside Expansion - In May 2016, WPL received an order from the PSCW approving a request for generation maintenance and performance improvements at Columbia Units 1 and 2.authorizing WPL expects to begin construction in the first half of 2015 and place the projects in service by the end of 2017.
April 2014 - The scrubber and baghouse at WPL’s Columbia Unit 2 were placed in service. In addition, the scrubber and baghouse at WPL’s Columbia Unit 1 were placed in service in July 2014.
May 2014 - The scrubber and baghouse at IPL’s George Neal Unit 3 were placed in service.
June 2014 - After receiving the final necessary regulatory approvals and permits in the second quarter of 2014, IPL began constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. IPL currently expects to place Marshalltown in service in the second quarter of 2017.
November 2014 - WPL announced plans to file a CPCN application with the PSCW in early 2015 for approval to construct an approximate 650730 MW natural gas-fired combined-cycle EGU in Beloit, Wisconsin, referred to as the Riverside expansion. A decision fromAfter receiving the PSCW on WPL’s request is currently expected by mid-2016. Construction of the Riverside expansion is also subject to the receipt of variousfinal necessary regulatory approvals and permits necessary to construct and operatein the EGU. Subject to such approvals, construction is currently expected to begin inthird quarter of 2016, and be completed by early 2019. Capital expenditures are currently estimated to be approximately $725 million to $775 million to constructWPL began constructing the EGU and a pipeline to supply natural gas to the EGU. The estimated capital expenditures exclude transmission network upgrades and AFUDC.
December 2014 - The MPUC issued an order approving the proposed sale of IPL’s Minnesota natural gas distribution assets. IPL currently expects to complete the sale in 2015 pending completion of various other contingencies. Proceeds from the sale of the natural gas distribution assets, which approximate the carrying value of such assets, are expected to be approximately $10 million, subject to customary closing adjustments.
December 2014 - The scrubber and baghouse at IPL’s Ottumwa Unit 1 were placed in service.
January 2015 - WPL received an order from the PSCW approving WPL’s CA application to install an SCR system at Columbia Unit 2 to reduce NOx emissions at the EGU. WPL’s portion of the capital expenditures for the SCR system, excluding AFUDC, is currently estimated to be between $60 million and $80 million.Riverside expansion. WPL currently expects to place the projectRiverside expansion in service in 2018.by early 2020. In November 2016, various electric cooperatives notified WPL of their intent to exercise their options to acquire approximately 65 MW of the Riverside expansion while the EGU is being constructed. As a result of the various electric cooperatives funding a portion of the capital expenditures during construction, WPL’s estimated portion of capital expenditures is expected to be approximately $640 million.


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WPL’s Wisconsin Retail Electric and Gas Rate Matters Highlights
Federal regulation of wholesale electric rates is administered by FERC and state regulation of retail utility rates is administered by the IUB, PSCW and MPUC. Key regulatory developments include the following. Refer to “Rate Matters” for a more detailed discussion of regulatory developments.
July 2014Case (2017/2018 Test Period) - In December 2016,WPL received an order from the PSCW authorizing WPL to maintainimplement an increase in annual retail electric base rates at their current levelsof $9 million, or approximately 1%, and an increase in annual retail gas rates of $9 million, or approximately 13%. These increases are effective January 1, 2017 and extend through the end of 2016.2018. The retail electric base rate caseorder included a return on common equity of 10.0% and continues a regulatory return on costs for emission controls projects at Columbia Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements at Columbia Units 1 and 2, other ongoing capital expenditures, and an increase in electric transmission service expense. The additional revenue requirement for these cost increases was offset by the impactcommon equity sharing mechanism, whereby WPL must defer a portion of changes in the amortization ofits earnings if its annual regulatory liabilities associated with energy efficiency cost recoveries and increased sales volumes. The order also authorized WPL to implement a $5 million decrease in annual retail gas base rates effective January 1, 2015 followed by a freeze of such gas base rates through the end of 2016.
September 2014 - The IUB approved a settlement agreement, which extends IPL’s Iowa retail electric base rates authorized in its 2009 test year case through 2016 and provides retail electric customer billing credits of $105 million in aggregate, including targeting $70 million in 2014 (beginning May 2014), $25 million in 2015 and $10 million in 2016. In 2014, IPL recorded $72 million of such retail electric customer billing credits. IPL will make adjustments to future billing credits to provide retail electric customer billing credits of $105 million in aggregate. The settlement agreement included the continuation of the energy adjustment clause, transmission cost rider and electric tax benefit rider credits; the ability for IPL to seek rate relief if a significant event occurs; and the ability for parties to the DAEC PPA proceeding to request show cause action if IPL’s Iowa retail electric return on common equity exceeds 11% for 2014, 2015 or 2016.10.25% during the 2017 and 2018 Test Period. WPL must defer 50% of its excess earnings between 10.25% and 11.00%, and 100% of any excess earnings above 11.00%.
December 2014
MISO Transmission Owner Return on Equity Complaints - WPL received an order fromA group of MISO cooperative and municipal utilities previously filed two complaints with FERC requesting a reduction to the PSCW authorizing an annual retail electric rate increase of $39 million, or approximately 4%, effective January 1, 2015. The increase includes $39 million of anticipated increases in retail electric fuel-related costs in 2015 attributable to $25 million for higher retail electric fuel-related costs per MWh anticipated in 2015base return on equity used by MISO transmission owners, including ITC and $14 million from the impact of increased sales volumes approved in the retail electric base rate case for 2015.
December 2014 - The IUBATC. In September 2016, FERC issued an order authorizing $75 millionon the first complaint and established a base return on equity of regulatory liabilities10.32%, excluding any incentive adders granted by FERC, effective September 28, 2016, and for the refund period from tax benefitsNovember 12, 2013 through February 11, 2015. In October 2016, in response to MISO’s and the MISO transmission owners’ request, FERC ordered the related refunds to be credited to IPL’s retail electric customers’ bills in Iowa duringissued no later than July 2017. In June 2016, a FERC administrative law judge issued an initial decision regarding the second complaint and recommended a base return on equity of 9.70%, excluding any incentive adders granted by FERC, for the refund period from February 12, 2015 through May 11, 2016. A final decision from FERC on the electric tax benefit rider. In December 2014, the IUB also authorized IPL to reduce the $75 million of billing credits on customers’ bills by $15 million in 2015 to recognize the revenue requirement impact of the changes in tax accounting methods.

Environmental Matters Highlights
Environmental matters are regulated by various federal, state and local authorities. Key environmental developments include the following. Refer to “Environmental Matters” for a more detailed discussion of environmental developments.
June 2014 - The EPA issued proposed standards to reduce CO2 emissions from existing fossil-fueled EGUs. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over the period from 2020 through 2029, and a “final goal” based on a three-year rolling average that each state meets beginning in 2030. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. The EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. In August 2014, the EPA’s legal authority to issue the proposed standards was challenged. The EPAsecond complaint is currently expected to issue final standards in 2015.
August 2014 - The EPA publishedthe first half of 2017. As a final rule related to Section 316(b)result of the Federal Clean Water Act ruletwo MISO complaints, Alliant Energy and WPL have realized a cumulative $24 million of reductions in the amounts of equity income from ATC through December 31, 2016, including $9 million realized in 2016.

Transfer of ATC Investment - In June 2016, WPL received an order from the PSCW requiring WPL to transfer its investment in ATC to Alliant Energy or an Alliant Energy subsidiary by December 31, 2022. On December 31, 2016, pursuant to the PSCW order, the investment in ATC was transferred to ATI. Refer to Note 6(a) for further discussion.
Common Stock Split-In April 2016, Alliant Energy’s Board of Directors approved a two-for-one common stock split and a proportionate increase in the number of authorized shares of common stock of Alliant Energy from 240 million shares to regulate cooling water intake structures and minimize adverse environmental impacts480 million shares to fish and other aquatic life. Compliance with this final rule will be incorporated during periodic facility permit renewal cycles, with final compliance anticipated by 2022.
December 2014 -implement the stock split. Alliant Energy shareowners of record at the close of business on May 4, 2016 received one additional share of Alliant Energy common stock for each share held on that date. The EPA issued the final CCR rule, which regulates CCRproportionate interest that a shareowner owns in Alliant Energy did not change as a non-hazardous waste.result of the stock split. The final rule establishes minimum criteria for disposing of CCRadditional shares were distributed on May 19, 2016 and post-split trading began on May 20, 2016. All Alliant Energy share and per share amounts in landfills and surface impoundments (ash ponds), and allows for continued operation of ash ponds if they meet certain location and performance criteria. The rule is currently anticipated to become effective in 2015.this report have been reflected on a post-split basis.
January 2015 - CSAPR replaced CAIR. Compliance with CSAPR emissions limits began in 2015, with additional emissions limits reductions beginning in 2017.

Legislative Matters Highlights
Various legislative developments are monitored, including those relatingFuture Developments - In 2017 and beyond, the following includes key items expected to energy, tax, financial and other matters. Key legislative developments include the following. Refer to “Legislative Matters” for a more detailed discussion of legislative developments.
December 2014 - The FTIP Act was enacted. The most significant provisions of the FTIP Act forimpact Alliant Energy, IPL and WPL relate to the extension of bonus depreciation deductions for certain expenditures for property that were incurred through December 31, 2014.WPL:

39



Planned Utility Rate Case - IPL currently expects to make a retail electric rate filing in the second quarter of 2017 based on a 2016 historical Test Year. Refer to “Rate Matters” for further discussion.

Liquidity2017 Forecast - In 2017, the following financing activities, and Capital Resources Highlights
Based on current liquidity positions and capital structures, the additional capital requiredimpacts to implement the strategic plan andresults of operations, are currently anticipated to meet long-term contractual obligations is expected to be available. Key financing developments include the following. Refer to “Liquidity and Capital Resources” for a more detailed discussion of financing developments.occur:
March 2014
Financing Plans - IPL extended through March 2016 the purchase commitment from the third party to which it sells its receivables.
October 2014 - WPL issued $250 million of 4.1% debentures due 2044. The proceeds from the issuance were used by WPL to reduce commercial paper and for general corporate purposes.
October 2014 - Alliant Energy entered into a $250 million variable-rate term loan credit agreement and used the proceeds from borrowings under this agreement to retire its $250 million, 4% senior notes. The term loan credit agreement expires in October 2016.
November 2014 - IPL issued $250 million of 3.25% senior debentures due 2024. The proceeds from the issuance were used by IPL to reduce cash proceeds received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt by $60 million and for general corporate purposes.
November 2014 - WPL received authorization from the PSCW to issue up to $500 million of long-term debt securities during 2015 and 2016, with no more than $300 million to be issued in either year.
November 2014 - Alliant Energy, IPL and WPL announced their future financing plans. IPL currently expects to issue up to $300 million of additional long-term debt in 2015. IPL’s $150 million, 3.3% senior debentures mature in 2015. Alliant Energy currently expects to issue approximately $150 million of common stock in 20152017 through one or more offerings and its Shareowner Direct Plan. Both IPL and WPL currently expect to receive capital contributions of approximately $150 million from their parent company, Alliant Energy, in 2017. IPL and WPL currently expect to issue up to $250 million and $300 million, respectively, of long-term debt securities in 2017.
November 2014
Common Stock Dividends - Alliant Energy announced an increase in its targeted 20152017 annual common stock dividend to $2.20$1.26 per share, which is equivalent to a quarterly rate of $0.55$0.315 per share, beginning with the February 20152017 dividend payment.
December 2014 - Franklin County Holdings LLC, Resources’ wholly-owned subsidiary, entered into a $60 The timing and amount of future dividends is subject to an approved dividend declaration from Alliant Energy’s Board of Directors, and is dependent upon earnings expectations, capital requirements, and general financial business conditions, among other factors. In addition, IPL and WPL currently expect to pay common stock dividends of approximately $156 million variable-rate term loan credit agreement and used the proceeds$126 million, respectively, to retire its borrowings under a term loan credit agreement that maturedtheir parent company in December 2014. The latest term loan credit agreement expires December 2016.2017.
Utility Electric Margins - Alliant Energy, IPL and WPL currently expect an increase in electric margins in 2017 compared to 2016 as a result of base rate increases in effect from WPL’s recent retail electric rate case and IPL’s planned retail electric rate case. Refer to “Rate Matters” for further discussion of these rate cases.
Other Operation and Maintenance Expenses - Alliant Energy currently expects its other operation and maintenance expenses to increase in 2017 compared to 2016 primarily due to IPL’s Marshalltown facility, which is expected to be placed in service in April 2017, as well as higher energy delivery infrastructure maintenance expenditures. Also contributing to the increase are energy efficiency regulatory amortizations at WPL, which will be offset by increases in WPL’s base rates as discussed in “Rate Matters.”
Depreciation and Amortization Expenses - Alliant Energy currently expects its depreciation and amortization expenses to increase in 2017 compared to 2016 due to property additions, including various environmental controls projects at IPL and WPL placed in service in 2016 and IPL’s Marshalltown facility, which is expected to be placed in service in April 2017. Refer to “Rate Matters” for discussion of updated depreciation rates for WPL effective January 1, 2017 as a result of a recently completed depreciation study.
December 2014
Interest Expense - At December 31, 2014, Alliant Energy currently expects its interest expense to increase in 2017 compared to 2016 due to financings completed in 2016 and its subsidiaries had $859 million of available capacity under the revolving credit facilities, $128 million of available capacity at IPL under its sales of accounts receivable program and $57 million of cash and cash equivalents.planned in 2017 as discussed above.

Other Matters Highlights
RESULTS OF OPERATIONS

Overview
Other key developmentsAlliant Energy - Executive Overview” provides an overview of Alliant Energy’s 2016 and 2015 earnings and the various components of its business.

IPL - Earnings available for common stock increased $30 million in 2016 and $4 million in 2015. The 2016 increase was due to higher AFUDC in 2016 related to Marshalltown, lower retail electric customer billing credits, losses recorded in 2015 related to IPL’s sales of its Minnesota electric and natural gas distribution assets and higher income tax benefits. These items were partially offset by higher depreciation and interest expenses. The 2015 increase was the result of lower retail electric customer billing credits and lower purchased electric capacity expense related to the previous DAEC PPA. These items were substantially offset by lower retail electric and gas sales due to changes in temperatures in IPL’s service territory, losses recorded in 2015 related to IPL’s sales of its Minnesota electric and natural gas distribution assets, higher depreciation expense and lower income tax benefits.

WPL - Earnings available for common stock increased $14 million in 2016 and decreased $4 million in 2015. The 2016 increase was due to higher retail electric sales, partially offset by higher depreciation expense. The 2015 decrease was the result of lower retail electric and gas sales due to changes in temperatures in WPL’s service territory. This was partially offset by changes in electric fuel-related costs, net of recoveries in 2015 compared to 2014.

Additional details of Alliant Energy’s, IPL’s and WPL’s 2016, 2015 and 2014 earnings are discussed below.

Utility Electric Margins - Electric margins are defined as electric operating revenues less electric production fuel, purchased power and electric transmission service expenses. Management believes that couldelectric margins provide a more meaningful basis for evaluating utility operations than electric operating revenues since electric production fuel, purchased power and electric transmission service expenses are generally passed through to customers, and therefore, result in changes to electric operating revenues that are comparable to changes in such expenses. These electric margins may not be comparable to how other entities define utility margin. Electric margins and MWh sales were as follows:
Alliant EnergyRevenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential (c)
$1,001.1
 
$983.0
 2% 
$994.5
 (1%) 7,152
 7,271
 (2%) 7,697
 (6%)
Commercial (c)712.6
 667.8
 7% 658.0
 1% 6,545
 6,374
 3% 6,449
 (1%)
Industrial (c)787.1
 763.4
 3% 735.1
 4% 10,702
 10,820
 (1%) 10,813
 —%
Industrial - co-generation64.0
 59.9
 7% 63.9
 (6%) 940
 915
 3% 1,008
 (9%)
Retail subtotal (c)2,564.8
 2,474.1
 4% 2,451.5
 1% 25,339
 25,380
 —% 25,967
 (2%)
Sales for resale:                   
Wholesale (c)256.6
 221.0
 16% 206.6
 7% 4,039
 3,614
 12% 3,586
 1%
Bulk power and other10.1
 28.5
 (65%) 2.9
 883% 360
 1,228
 (71%) 335
 267%
Other44.0
 46.9
 (6%) 52.6
 (11%) 100
 129
 (22%) 155
 (17%)
Total revenues/sales2,875.5
 2,770.5
 4% 2,713.6
 2% 29,838
 30,351
 (2%) 30,043
 1%
Electric production fuel expense408.1
 463.6
 (12%) 443.9
 4%          
Purchased power expense445.9
 374.1
 19% 433.3
 (14%)          
Electric transmission service expense527.9
 485.3
 9% 447.5
 8%          
Electric margins (d)
$1,493.6
 
$1,447.5
 3% 
$1,388.9
 4%          
IPLRevenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential (c)
$536.7
 
$540.3
 (1%) 
$556.4
 (3%) 3,633
 3,843
 (5%) 4,164
 (8%)
Commercial (c)445.4
 416.3
 7% 410.2
 1% 4,159
 4,059
 2% 4,099
 (1%)
Industrial (c)396.4
 393.7
 1% 394.6
 —% 5,791
 6,007
 (4%) 6,124
 (2%)
Industrial - co-generation64.0
 59.9
 7% 63.9
 (6%) 940
 915
 3% 1,008
 (9%)
Retail subtotal (c)1,442.5
 1,410.2
 2% 1,425.1
 (1%) 14,523
 14,824
 (2%) 15,395
 (4%)
Sales for resale:                   
Wholesale (c)94.2
 56.4
 67% 32.2
 75% 1,360
 845
 61% 485
 74%
Bulk power and other3.6
 5.1
 (29%) 2.1
 143% 46
 178
 (74%) 59
 202%
Other29.4
 32.1
 (8%) 33.9
 (5%) 41
 67
 (39%) 81
 (17%)
Total revenues/sales1,569.7
 1,503.8
 4% 1,493.3
 1% 15,970
 15,914
 —% 16,020
 (1%)
Electric production fuel expense159.1
 194.5
 (18%) 231.5
 (16%)          
Purchased power expense271.4
 233.9
 16% 265.8
 (12%)          
Electric transmission service expense359.7
 328.2
 10% 323.4
 1%          
Electric margins (d)
$779.5
 
$747.2
 4% 
$672.6
 11%          

WPLRevenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential
$464.4
 $442.7 5% $438.1 1% 3,519
 3,428
 3% 3,533
 (3%)
Commercial267.2
 251.5
 6% 247.8
 1% 2,386
 2,315
 3% 2,350
 (1%)
Industrial390.7
 369.7
 6% 340.5
 9% 4,911
 4,813
 2% 4,689
 3%
Retail subtotal1,122.3
 1,063.9
 5% 1,026.4
 4% 10,816
 10,556
 2% 10,572
 —%
Sales for resale:                   
Wholesale162.4
 164.6
 (1%) 174.4
 (6%) 2,679
 2,769
 (3%) 3,101
 (11%)
Bulk power and other6.5
 23.4
 (72%) 0.8
 2,825% 314
 1,050
 (70%) 276
 280%
Other14.6
 14.8
 (1%) 18.7
 (21%) 59
 62
 (5%) 74
 (16%)
Total revenues/sales1,305.8
 1,266.7
 3% 1,220.3
 4% 13,868
 14,437
 (4%) 14,023
 3%
Electric production fuel expense249.0
 269.1
 (7%) 212.4
 27%          
Purchased power expense174.5
 140.2
 24% 167.5
 (16%)          
Electric transmission service expense168.2
 157.1
 7% 124.1
 27%          
Electric margins$714.1 $700.3 2% $716.3 (2%)          

(a)
Reflects the % change from 2015 to 2016. (b) Reflects the % change from 2014 to 2015.
(c)On July 31, 2015, IPL sold its electric distribution assets in Minnesota. Prior to the asset sale, the related electric sales are included in residential, commercial and industrial retail sales. Subsequent to the asset sale, the related electric sales are included in wholesale electric sales pursuant to a wholesale power supply agreement between IPL and Southern Minnesota Energy Cooperative.
(d)
Includes $64 million, $72 million and $85 million of electric tax benefit rider credits on IPL’s Iowa retail electric customers’ bills for 2016, 2015 and 2014, respectively. The electric tax benefit rider resulted in reductions in electric revenues that were offset by reductions in income tax expense for 2016, 2015 and 2014.

Variances - Variances between periods in electric margins were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Higher revenues at IPL due to lower retail electric customer billing credits related to the approved retail electric base rate freeze through 2016 (Refer to Note 2 for details)

$15
 
$15
 
$—
Estimated changes in sales caused by temperatures (Refer to “Temperatures” below for details)15
 10
 5
Higher revenues at IPL due to fewer electric tax benefit rider credits on customers’ bills (Refer to Note 2 for details)
8
 8
 
Higher electric transmission service expense at WPL (Refer to “Electric Transmission Service Expense” below for details)(11) 
 (11)
Other (a)19
 (1) 20
 
$46
 
$32
 
$14
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Higher revenues at IPL due to lower retail electric customer billing credits related to the approved retail electric base rate freeze (Refer to Note 2 for details)

$48
 
$48
 
$—
Lower purchased electric capacity expense at IPL attributed to the previous DAEC PPA, which ended in February 201425
 25
 
Higher revenues at IPL due to fewer electric tax benefit rider credits on customers’ bills (Refer to Note 2 for details)
13
 13
 
Changes in electric fuel-related costs, net of recoveries at WPL (Refer to “Electric Production Fuel and Purchased Power (Fuel-related) Expenses” below for details)11
 
 11
Higher revenues at WPL from the impact of increased sales volumes approved in its retail electric base rate case for 2015 (b)9
 
 9
Higher electric transmission service expense at WPL (Refer to “Electric Transmission Service Expense” below for details)(33) 
 (33)
Estimated changes in sales caused by temperatures (Refer to “Temperatures” below for details)(19) (10) (9)
Other (a)5
 (1) 6
 
$59
 
$75
 
($16)


(a)Includes increases in temperature-normalized retail sales volumes at WPL in 2016 and 2015. Refer to “Sales Trends” below for more information.
(b)The PSCW order received for WPL’s retail fuel-related rate filing (2015 Test Year) contained an increase in retail electric fuel-related revenues in 2015. A portion of the approved increase was attributable to the impact of increased sales volumes approved in WPL’s retail electric base rate case for 2015 resulting in higher electric margin in 2015.

Temperatures - Electric sales demand is seasonal to some extent with the annual peak normally occurring in the summer months due to air conditioning usage by residential, commercial and wholesale customers. Electric sales are also impacted to a certain extent in the winter months due to heating requirement usage. HDD data is used to measure the variability of temperatures during winter months and is correlated with both electric and gas sales demand. CDD data is used to measure the variability of temperatures during summer months and is correlated with electric sales demand. HDD and CDD are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical HDD and CDD. HDD and CDD in Alliant Energy’s service territories were as follows:
 Actual  
 2016 2015 2014 Normal
HDD:       
Cedar Rapids, Iowa (IPL)5,933
 6,300
 7,657
 6,798
Madison, Wisconsin (WPL)6,420
 6,667
 7,884
 7,082
CDD:       
Cedar Rapids, Iowa (IPL)971
 732
 670
 766
Madison, Wisconsin (WPL)780
 665
 620
 662

Estimated increases (decreases) to electric margins from the impacts of temperatures were as follows (in millions):
 2016 2015 2014
IPL
$3
 
($7) 
$3
WPL1
 (4) 5
Total Alliant Energy
$4
 
($11) 
$8

Sales Trends - Alliant Energy’s retail sales volumes remained unchanged in 2016 and decreased 2% in 2015. During 2016, WPL’s retail sales volumes increased due to the impact future financial conditionof temperatures on residential and commercial sales resulting in higher cooling demand in 2016, an extra day of retail sales during the first quarter of 2016 due to the leap year and higher commercial and industrial sales driven by customer expansions. This increase was offset by a decrease in IPL’s retail sales volumes primarily related to IPL’s sale of its Minnesota electric distribution assets in 2015. The decrease in IPL’s retail sales was partially offset by the impact of temperatures on residential and commercial sales resulting in higher cooling demand in 2016, an extra day of retail sales during the first quarter of 2016 due to the leap year and an increase in commercial sales driven by customer expansion.

The 2015 decrease was primarily due to the impact of temperatures on residential and commercial sales resulting in lower heating demand in 2015 compared to 2014 and decreased retail sales related to IPL’s sale of its Minnesota electric distribution assets in 2015. WPL’s industrial sales volumes increased 3% in 2015 primarily due to production expansion at one of its industrial customers.

Alliant Energy’s wholesale sales volumes increased 12% in 2016 and 1% in 2015. The increases were primarily due to additional sales from IPL’s wholesale power supply agreement with Southern Minnesota Energy Cooperative effective August 1, 2015. The increases were partially offset by decreased sales to WPL’s partial-requirement wholesale customers that have contractual options to be served by WPL, other power supply sources or results of operations include the following.MISO market. Refer to “Other MattersFuture Considerations” for discussion of notifications provided to each of IPL and WPL to terminate certain of their wholesale power supply agreements.

Alliant Energy’s bulk power and other sales volume changes were largely due to changes in sales in the wholesale energy markets operated by MISO. These changes are impacted by several factors including the availability and dispatch of Alliant Energy’s EGUs and electricity demand within these wholesale energy markets. Changes in bulk power and other sales revenues were largely offset by changes in fuel-related costs, and therefore, did not have a significant impact on electric margins.


Electric Production Fuel and Purchased Power (Fuel-related) Expenses - Fossil fuels, such as natural gas and coal, are burned to produce electricity at EGUs. The cost of fossil fuels used during each period is included in electric production fuel expense. Electricity is also purchased to meet customer demand and these costs are charged to purchased power expense.

Due to IPL’s cost recovery mechanisms for fuel-related expenses, changes in fuel-related expenses resulted in comparable changes in electric revenues, and therefore, did not have a significant impact on Alliant Energy’s and IPL’s electric margins. WPL’s cost recovery mechanism for wholesale fuel-related expenses also provides for adjustments to its wholesale electric rates for changes in commodity costs, thereby mitigating impacts of changes to commodity costs on Alliant Energy’s and WPL’s electric margins.

WPL’s cost recovery mechanism for retail fuel-related expenses supports deferrals of amounts that fall outside an approved bandwidth of plus or minus 2% of forecasted fuel-related expenses determined by the PSCW each year. The difference between revenue collected and actual fuel-related expenses incurred within the bandwidth increases or decreases Alliant Energy’s and WPL’s electric margins. WPL estimates the increase (decrease) to electric margins from amounts within the bandwidth were approximately $6 million, $6 million and ($5) million in 2016, 2015, and 2014, respectively. Refer to Note 2 for discussion of deferred fuel-related costs that were outside the approved bandwidth incurred in 2016, 2015 and 2014.

Refer to “Other Matters - Market Risk Sensitive Instruments and Positions” for further discussion of risks associated with increased fuel-related expenses on WPL’s electric margins. Refer to “Rate Matters” and Note 1(g) for additional information relating to recovery mechanisms for fuel-related expenses.

2016 vs. 2015 Summary - Alliant Energy’s electric production fuel expense decreased $56 million in 2016 primarily due to lower dispatch of IPL’s and WPL’s coal-fired EGUs during 2016 due to lower wholesale energy market prices and WPL’s retirement of Nelson Dewey Units 1 and 2 in December 2015. The decrease was also due to changes in the under-/over-collection of fuel-related expenses at IPL and lower natural gas prices. These items were partially offset by changes in the under-/over-collection of fuel-related expenses that were outside the approved bandwidth at WPL.

Alliant Energy’s purchased power expense increased $72 million in 2016 primarily due to increased volumes purchased resulting from lower dispatch of IPL’s and WPL’s coal-fired EGUs during 2016.

2015 vs. 2014 Summary - Alliant Energy’s electric production fuel expense increased $20 million in 2015 primarily due to changes in the under-/over-collection of fuel-related expenses that were outside the approved bandwidth at WPL. These items were partially offset by lower dispatch of IPL’s coal-fired EGUs during 2015 and changes in the under-/over-collection of fuel-related expenses at IPL.

Alliant Energy’s purchased power expense decreased $59 million in 2015 primarily due to lower prices for electricity purchased by IPL and WPL from MISO wholesale energy markets and decreased volumes purchased due to lower electric sales. The decrease was also due to purchased electric capacity expense at IPL attributed to the previous DAEC PPA, which expired in February 2014.

Electric Transmission Service Expense - Variances between periods in electric transmission service expense were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Higher electric transmission service costs billed from ITC, ATC and MISO primarily due to increased electric transmission service rates
$35
 
$18
 
$17
Changes at IPL in the under-/over-collection of electric transmission service expense through the transmission cost rider (a)12
 12
 
Changes in WPL’s costs deferred pursuant to escrow treatment for the difference between actual electric transmission service costs and those costs used to determine rates (a)(7) 
 (7)
Other3
 2
 1
 
$43
 
$32
 
$11

2015 vs. 2014 Summary:Alliant Energy IPL WPL
Higher electric transmission service costs billed from ITC, ATC and MISO primarily due to increased electric transmission service rates
$18
 
$6
 
$12
WPL escrow treatment for the difference between actual electric transmission service costs and those costs used to determine rates (a)21
 
 21
Other(1) (1) 
 
$38
 
$5
 
$33

(a)
Refer to Notes 1(g) and 2 for additional information relating to recovery of electric transmission service expenses.

Refer to “Other Future Considerations” for additional information on sales trends and electric transmission service expense. Refer to “Rate Matters” and Note 2 for information on electric rate increases in 2017.

Utility Gas Margins - Gas margins are defined as gas operating revenues less cost of gas sold. Management believes that gas margins provide a more detailedmeaningful basis for evaluating utility operations than gas operating revenues since cost of gas sold is generally passed through to customers, and therefore, results in changes to gas operating revenues that are comparable to changes in cost of gas sold. These gas margins may not be comparable to how other entities define utility margin. Gas margins and Dth sales were as follows:
Alliant EnergyRevenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential
$197.6
 
$215.1
 (8%) 
$287.5
 (25%) 25,571
 26,672
 (4%) 31,718
 (16%)
Commercial109.6
 120.5
 (9%) 172.8
 (30%) 18,820
 18,966
 (1%) 23,301
 (19%)
Industrial15.2
 14.3
 6% 23.4
 (39%) 3,352
 2,997
 12% 3,710
 (19%)
Retail subtotal322.4
 349.9
 (8%) 483.7
 (28%) 47,743
 48,635
 (2%) 58,729
 (17%)
Transportation/other33.0
 31.3
 5% 33.8
 (7%) 77,485
 74,162
 4% 64,717
 15%
Total revenues/sales355.4
 381.2
 (7%) 517.5
 (26%) 125,228
 122,797
 2% 123,446
 (1%)
Cost of gas sold194.3
 219.1
 (11%) 327.8
 (33%)          
Gas margins (c)
$161.1
 
$162.1
 (1%) 
$189.7
 (15%)          
IPLRevenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential
$110.6
 
$120.0
 (8%) 
$162.5
 (26%) 13,788
 14,472
 (5%) 17,839
 (19%)
Commercial61.9
 67.9
 (9%) 96.1
 (29%) 10,143
 10,166
 —% 12,641
 (20%)
Industrial10.6
 10.5
 1% 17.4
 (40%) 2,299
 2,239
 3% 2,804
 (20%)
Retail subtotal183.1
 198.4
 (8%) 276.0
 (28%) 26,230
 26,877
 (2%) 33,284
 (19%)
Transportation/other20.9
 18.9
 11% 20.5
 (8%) 37,158
 34,129
 9% 31,377
 9%
Total revenues/sales204.0
 217.3
 (6%) 296.5
 (27%) 63,388
 61,006
 4% 64,661
 (6%)
Cost of gas sold111.0
 123.3
 (10%) 185.5
 (34%)          
Gas margins (c)
$93.0
 
$94.0
 (1%) 
$111.0
 (15%)          
WPLRevenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2016 2015 (a) 2014 (b) 2016 2015 (a) 2014 (b)
Residential
$87.0
 
$95.1
 (9%) 
$125.0
 (24%) 11,783
 12,200
 (3%) 13,879
 (12%)
Commercial47.7
 52.6
 (9%) 76.7
 (31%) 8,677
 8,800
 (1%) 10,660
 (17%)
Industrial4.6
 3.8
 21% 6.0
 (37%) 1,053
 758
 39% 906
 (16%)
Retail subtotal139.3
 151.5
 (8%) 207.7
 (27%) 21,513
 21,758
 (1%) 25,445
 (14%)
Transportation/other12.1
 12.4
 (2%) 13.3
 (7%) 40,327
 40,033
 1% 33,340
 20%
Total revenues/sales151.4
 163.9
 (8%) 221.0
 (26%) 61,840
 61,791
 —% 58,785
 5%
Cost of gas sold83.3
 95.8
 (13%) 142.3
 (33%)          
Gas margins
$68.1
 
$68.1
 —% 
$78.7
 (13%)          

(a)
Reflects the % change from 2015 to 2016. (b) Reflects the % change from 2014 to 2015.
(c)Includes $12 million of gas tax benefit rider credits on IPL’s Iowa retail gas customers’ bills for each of 2016, 2015 and 2014. The gas tax benefit rider resulted in reductions in gas revenues that were offset by reductions in income tax expense for 2016, 2015 and 2014.


Variances - Variances between periods in gas margins were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Estimated changes in sales caused by temperatures (Refer to “Temperatures” below for details)
($3) 
($2) 
($1)
Other2
 1
 1
 
($1) 
($1) 
$—
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Estimated changes in sales caused by temperatures (Refer to “Temperatures” below for details)
($14) 
($7) 
($7)
Lower revenues at IPL related to changes in recovery amounts for energy efficiency costs through the energy efficiency rider (a)(9) (9) 
Lower revenues at WPL due to the impact of changes in retail gas base rates effective January 2015(4) 
 (4)
Other(1) (1) 
 
($28) 
($17) 
($11)

(a)Changes in gas energy efficiency revenues were mostly offset by changes in energy efficiency expense included in other operation and maintenance expenses.

Temperatures - Gas sales demand follows a seasonal pattern with an annual base load of gas and a large heating peak occurring during the winter season. HDD data is used to measure the variability of temperatures during winter months and is correlated with gas sales demand. Refer to “Utility Electric Margins” for HDD data details. Estimated increases (decreases) to gas margins from the impacts of temperatures were as follows (in millions):
 2016 2015 2014
IPL
($4) 
($2) 
$5
WPL(3) (2) 5
Total Alliant Energy
($7) 
($4) 
$10

Cost of Gas Sold - Alliant Energy’s cost of gas sold decreased $25 million in 2016 and $109 million in 2015. The decrease in 2016 was primarily due to lower natural gas prices. The decrease in 2015 was primarily due to lower retail gas volumes at IPL and WPL caused by temperatures discussed above and lower natural gas prices. Refer to Note 1(g) for additional information relating to natural gas cost recoveries.

Refer to Note 2 for information on gas rate increases in 2017.

Other Utility Revenues - Variances between periods in utility other revenues were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Lower steam sales
($3) 
($3) 
$—
Other(6) (4) (3)
 
($9) 
($7) 
($3)
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Lower margins from IPL’s sharing mechanism related to optimizing gas capacity contracts (a)
($5) 
($5) 
$—
Other(3) 
 (3)
 
($8) 
($5) 
($3)

(a)Approximately 50% of all margins earned from IPL’s sharing mechanism relating to optimizing gas capacity contracts flow through the gas adjustment clause to reduce retail gas customer bills in Iowa. The remaining margins are retained by IPL and recorded in utility other revenues. Due to the extreme cold temperatures causing natural gas price fluctuations in the first quarter of 2014, margins were higher than normal in 2014.

Non-regulated Revenues - Alliant Energy’s non-regulated revenues decreased $9 million in 2015, primarily due to decreased revenues at Transportation resulting from decreased demand for freight, barge and transfer services.


Asset Valuation Charges for Franklin County Wind Farm - Refer to Note 3 for details of asset valuation charges recorded in 2016 by Alliant Energy for the Franklin County wind farm.

Other Operation and Maintenance Expenses- Variances between periods in other operation and maintenance expenses were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Lower energy efficiency cost recovery amortizations at WPL (a)
($15) 
$—
 
($15)
Losses on sales of IPL’s Minnesota distribution assets recorded in 2015 (Refer to Note 3 for details)
(14) (14) 
Voluntary employee separation charges in 2015 (Refer to Note 12(a) for details)
(8) (5) (3)
Higher bad debt expense at IPL (b)9
 9
 
Higher stock-based performance compensation expense (Refer to Note 12(b) for details)
7
 4
 3
Higher employee benefits-related expense (c)7
 5
 2
Other (includes lower costs due to cost controls and operational efficiencies)(9) (5) (3)
 
($23) 
($6) 
($16)
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Lower energy efficiency cost recovery amortizations at WPL (a)
($38) 
$—
 
($38)
Lower generation expense (d)(13) (2) (11)
Changes in energy efficiency expense at IPL (e)(5) (5) 
Losses on sales of IPL’s Minnesota distribution assets recorded in 2015 (Refer to Note 3 for details)
14
 14
 
Higher employee benefits-related expense (c)14
 7
 7
Voluntary employee separation charges in 2015 (Refer to Note 12(a) for details)
8
 5
 3
Other (includes lower costs due to cost controls and operational efficiencies)(16) (10) (3)
 
($36) 
$9
 
($42)

(a)The July 2014 PSCW order for WPL’s 2015/2016 Test Period electric and gas base rate case authorized lower energy efficiency cost recovery amortizations for 2015 and 2016. The July 2012 PSCW order for WPL’s 2013/2014 Test Period electric and gas base rate case authorized changes in energy efficiency cost recovery amortizations for 2014. Regulatory amortizations at WPL related to energy efficiency costs were ($11) million, $4 million and $42 million in 2016, 2015 and 2014, respectively.
(b)Primarily due to an increase in IPL’s allowance for doubtful accounts as a result of increases in past due accounts receivable.
(c)Primarily due to an increase in retirement plans costs and other employee benefits-related costs. The increased retirement plan costs in 2016 were largely due to lower than expected returns on plan assets in 2015. The increased retirement plan costs in 2015 were largely due to decreases in discount rates and a change to life expectancy assumptions in 2014.
(d)Primarily due to the timing and extent of maintenance projects at IPL’s and WPL’s EGUs.
(e)Changes in IPL’s energy efficiency expense were offset by changes in electric and gas energy efficiency revenues.

Depreciation and Amortization Expenses - Variances between periods in depreciation and amortization expenses were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Higher amortization expense from the new customer billing and information system placed in service in 2015
$8
 
$4
 
$4
Lower depreciation expense from the sale of IPL’s Minnesota distribution assets in 2015(3) (3) 
Other (includes the impact of property additions)5
 3
 4
 
$10
 
$4
 
$8
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Higher depreciation expense for IPL’s Ottumwa Unit 1 scrubber and baghouse placed in service in 2014
$5
 
$5
 
$—
Other (includes the impact of other property additions)8
 5
 3
 
$13
 
$10
 
$3


Interest Expense- Variances between periods in interest expense were as follows (in millions):
2016 vs. 2015 Summary:Alliant Energy IPL WPL
Higher interest expense from the issuance of IPL’s $250 million, 3.4% senior debentures in August 2015
$5
 
$5
 
$—
Other4
 1
 (1)
 
$9
 
$6
 
($1)
2015 vs. 2014 Summary:Alliant Energy IPL WPL
Higher interest expense from the issuance of WPL’s $250 million, 4.1% debentures in October 2014
$8
 
$—
 
$8
Higher interest expense from the issuance of IPL’s $250 million, 3.25% senior debentures in November 20148
 8
 
Lower interest expense from the retirement of Alliant Energy’s $250 million, 4% senior notes in October 2014(8) 
 
Other(1) (1) (2)
 
$7
 
$7
 
$6

Refer to Note 9 for additional details of debt.

Equity Income from Unconsolidated Investments, Net - In 2016, Alliant Energy’s and WPL’s equity income from unconsolidated investments increased $6 million and $5 million, respectively, primarily due to higher ATC income and lower reserves for rate refunds recorded at ATC in 2016 compared to 2015. In 2015, Alliant Energy’s and WPL’s equity income from unconsolidated investments decreased $7 million and $8 million, respectively, primarily due to reserves for rate refunds recorded at ATC in 2015. Refer to “Other Future Considerations” for discussion of potential impacts to future financial condition and results of operations.
October 2014 - FERC issued an order on a complaint againstpending with FERC regarding the MISO transmission owners. The order established hearing and settlement procedures on thelevel of return on equity component of the complaint, and established a refund period back to November 12, 2013. FERC also denied a request to limit the regulatory capital structure to 50% of common equity, among other items. Settlement discussions between the parties were held and no agreement was reached. The complaint is now subject to hearing procedures and an initial decision from FERC on the complaint is currently expected in late 2015. Alliant Energy, IPL and WPL are currently unable to determine what, if any, impact the October 2014 FERC order, subsequent hearing procedures and a new methodology FERC established for determining the return on equity may have on the returns authorized by FERC forthat MISO transmission owners including ITC and ATC.
January 2015 - FERC issued an order accepting a request from a group(including ATC) should be allowed to utilize in calculating the rates they charge their customers. Refer to Note 6(a) for discussion of MISO transmission owners, including ITC andWPL’s transfer of its investment in ATC to implement a 50 basis point incentive adder to their return on equity based on participation in MISO. The implementation of the adder is effective January 2015, subject to certain conditions. Alliant Energy, IPL and WPL are currently unable to determine any resulting changes to future electric transmission service charges.ATI.

AFUDC - Refer to Note 3 for details of AFUDC recognized in 2016, 2015 and 2014.

Income Taxes - Refer to Note 11 for details of effective income tax rates for continuing operations.

Loss from Discontinued Operations, Net of Tax - Refer to Note 19 for discussion of discontinued operations.

STRATEGIC OVERVIEW

Strategic Plan - The strategic plan focuses on the core business of delivering regulated electriccreating customer growth and natural gas service invalue across IPL’s Iowa and WPL’s Wisconsin service territories. Customers have evolving expectations and access to increasingly competitive alternatives for energy. As a result, providing customized energy solutions while aggressively managing customer prices remains at the center of the strategic plan. Successful implementation of the strategic plan will result in increased earnings for Alliant Energy, IPL and WPL while limiting cost increases for IPL’s and WPL’s customers. The strategic plan is built upon threetwo key elements: competitive costs, safeGrowth and reliable service, and responsible resources.Optimization.

Competitive CostsGrowth - Providing competitive and predictable energy costs for customers is a keyThe growth element of the strategic plan. The majorityplan includes accelerating the growth of customers’ electric and gas usage and expanding the portfolio of energy costs become part of rates charged toresources with additional clean and renewable energy. Increasing electric and gas usage in IPL’s and WPL’s service territories is expected to help minimize individual customer prices, and expanding clean and renewable energy will help customers meet sustainability objectives and reduce Alliant Energy’s carbon emissions.

Accelerate Electric and Gas Growth - Actions to accelerate the growth of customers’ electric and gas usage include: retention of current customers and any rate increase has an impactgrowth of new customers, economic development opportunities designed to attract new customers, and efforts to promote additional markets for electricity and gas, such as the electrification of the transportation sector (e.g. electric vehicles).

To help support retention and growth of current customers, the strategic plan focuses on such customers. Given that potential public policy changespromoting energy efficiency and resulting increases in futureusing new and existing technologies and customized energy solutions, which are expected to help reduce energy costs, are possible, thereprovide flexibility, increase productivity and help customers achieve sustainability objectives.

Economic development across Iowa and Wisconsin is a focusfocused on controlling costs with the intent ofattracting new businesses by providing competitive ratesplanning resources and energy solutions that encourage companies to invest in IPL’s and WPL’s customers.service territories. For example, IPLthe Big Cedar

Industrial Center announced in November 2016 is a 1,300 acre rail-served manufacturing and WPL have retail electric base rate freezesindustrial site in IowaIowa. This ready-to-build site is in close proximity to regional airport and Wisconsin, respectively, during 2015interstate freeways and 2016. IPL also hasoffers access to IPL’s electric and gas tax benefit riders, which utilize tax benefits from income tax strategies to provide credits on Iowa retail

40



customers’ bills to help offset impacts of rate increases. Refer to Note 2 for additional discussion of the retail electric base rate freezes, and Note 11 and “Rate Matters” for further discussion of the tax benefit riders.

Safe and Reliable Service - The strategic plan also focuses resources on providing safe and reliable electricity and natural gas service. Investmentsservices. In addition, investments are expected to be targeted in electric andmade to extend various gas distribution system improvements, replacing aging infrastructuretransmission and distribution grid efficiencysystems in IPL’s and WPL’s service territories to maintain strong reliability. System performanceserve new customer demand for natural gas.

Expand Clean and Renewable Energy - The expansion of clean and renewable energy contributes to a more diverse energy portfolio and reduces emissions from EGUs. Alliant Energy is monitoredcurrently constructing two highly efficient natural gas-fired combined-cycle EGUs and necessary stepsis also focused on expanding its renewable generation portfolio with wind and solar. These new generation projects are takenexpected to continually improveincrease customer access to low-cost energy resources, and also support the safetyretirement of various older, smaller and reliability of service for customers. Providing exceptional customer service, including emergencyless efficient coal-fired EGUs, resulting in Alliant Energy reducing its carbon emissions and outage response, is part of the mission and commitment to customers.helping customers meet sustainability initiatives.

Responsible Resources-Optimization Another- The second key element of the strategic plan focuses resources on providing reliable electric and natural gas service to customers in IPL’s and WPL’s service territories through continued modernization of the power grid and gas distribution system and optimization of the generation fleet. Modernizing and optimizing the distribution and generation assets is finding innovative waysexpected to meet environmental objectives, improve energy efficiencymaximize the value of Alliant Energy’s existing infrastructure, expand customer options, and be more price-competitive and market-responsive for customers. For example, customer engagement initiatives include new pricing options and enhanced communication through mobile devices for customers.

Alliant Energy is modernizing the power grid to accommodate a growing two-way flow of electricity and information. This includes targeting investments in replacing and upgrading aging infrastructure in the electric distribution system. This also includes making investments in advanced metering infrastructure and a customer billing and information system, which support the integration of new technologies, as well as improving the security, reliability and resiliency of the power grid.

Since 2010, Alliant Energy has retired or fuel-switched approximately one-third of its older, smaller, less efficient and more costly coal-fired EGUs, and has made investments in its newer, more efficient coal-fired EGUs. Alliant Energy is also investing in responsive and cost-effective natural gas-fired generation, which complements its growing investments in renewable energy. These investments are expected to help reduce cost and provide resource flexibility.competitively-priced electricity for customers.

Generation Plans - A diversified fuel mix for EGUs is important to meetmeeting the energy needs of customers and also recognizes the importance of using resources in efficient and environmentally responsible ways for the benefit of future generations. The current strategic plan which is focused on a balanced and flexible portfolio of energy resources to meet IPL’s and WPL’s customers’ short- and long-term energy needs, includes the following diversified and responsible portfolio of energy resources:

Natural gas - purchasing, constructing and/or converting to natural gas-fired EGUs. IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined cycle EGU,
Renewables - operating wind farms, solar projects and M.L. Kapp Unit 2 is expectedhydroelectric generators, as well as developing future wind sites and solar projects.
PPAs - purchasing electricity to switch from coal to natural gas as its only fuel type in 2015. WPL currently plans to filemeet a CPCN application with the PSCW in early 2015portion of customers’ demand for approval to construct an approximate 650 MW natural gas-fired combined cycle EGU referred to as the Riverside expansion.electricity, including wind, solar power and nuclear generation PPAs.
Coal - implementing emissionenvironmental controls and generation performance and reliability improvements at newer, larger and more efficient coal-fired EGUs, and fuel switching at, and retirement of, certain older, smaller and less efficient coal-fired EGUs.
PPAs - purchasing electricity to meet a portion of customer demand for electricity, including wind power PPAs and a nuclear generation PPA related to DAEC for a term of February 22, 2014 through December 31, 2025.
Renewables - operating hydroelectric generators and current wind projects, as well as evaluating the development of future wind sites and solar projects. IPL and WPL currently have up to 400 MW and 200 MW of undeveloped wind sites, respectively, available for future wind projects. Alliant Energy, IPL and WPL are also exploring opportunities to integrate solar projects into the portfolio of energy resources as the cost to produce solar energy continues to decline.

Installing emission controls at the more efficient coal-fired EGUs, increasingIncreasing levels of energy produced by natural gas-fired EGUs, and increasing levels of energy produced by wind projectsfarms and other renewable energy resources, resultsand installing environmental controls at the more efficient coal-fired EGUs, result in significant environmental benefits. As a result of these efforts, SO2 and NOx emissions are currently expected to be reduced by approximately 90% and 80%, respectively, from 2005 levels by 2025.2020. Mercury emissions are currently expected to be reduced by approximately 90% from 2009 levels by 2025.2020. CO2 emissions have been reduced by approximately 15%22% from 2005 levels. Additional generation portfolio details, as well as discussion of investments in emission controlslevels and performance and reliability upgrades, are included in “Generation Plans” and “Environmental Compliance Plans” below.currently expected to be reduced by 40% from 2005 levels by 2030.

Energy efficiency is also an important part of the strategic plan and provides customers with the opportunity to reduce their energy usage and related costs through the use of new energy efficient equipment, products and practices. IPL currently expects to spend approximately $400 million for electric and natural gas energy efficiency programs in Iowa from 2014 through 2018. In addition, WPL contributes 1.2% of its annual utility revenues to Wisconsin’s Focus on Energy program. Refer to “Energy Efficiency Programs” below for further discussion of energy efficiency programs.

Non-regulated Operations - The strategic plan for Alliant Energy’s non-regulated operations involves maintaining a modest portfolio of businesses that are accretive to earnings and cash flows but not significant users of capital.

Generation Plans -Generation plans are reviewed and updated as deemed necessary and in accordance with regulatory requirements. Alliant Energy, IPL and WPL are currently evaluating the types of capacity and energy additions they will pursue to meet their customers’ long-term energy needs and are monitoring several related external factors that could influence those evaluations. Environmental compliance plans have also been developed to ensure cost effective compliance with current and proposed environmental laws and regulations impacting existing EGUs. Some of thesethe external factors impacting these plans include regulatory policies and decisions,decisions; changes in long-term projections of customer demand,demand; availability and cost effectiveness of different generation technologies,and emission reduction technologies; developments related to environmental regulations; settlements reached with environmental agencies and citizens groups; forward market prices for fossil fuels and electricity; market conditions for obtaining financing,financing; developments related to federal and state RPS,renewable portfolio standards; environmental

requirements, such as any future requirements relating to GHG emissions or renewable energy sources,sources; and federal and state tax incentives. Refer to “Environmental Matters” for details of current and proposed environmental regulations and requirements.


41



Natural Gas-Fired Generation -
IPL’s Construction of Marshalltown - In 2013, the IUB issued an order approving a siting certificate and establishing rate-making principles for IPL’s construction of an approximate 650 MW natural gas-fired combined-cycle EGU in Marshalltown, Iowa, referred to as Marshalltown. In 2013, IPL accepted the IUB’s rate-making principles, which include the following:

A cost cap of $920 million, including costs to construct Marshalltown, a pipeline to supply natural gas to Marshalltown and transmission network upgrades to transmit electricity from Marshalltown, as well as AFUDC. Any costs incurred in excess of the cost cap are expected to be incorporated into rates if determined to be reasonable and prudent.
An 11% return on common equity for the 35-year depreciable life of Marshalltown and a 10.3% return on common equity for the calculation of AFUDC related to the construction of Marshalltown.
The application of double leverage is deferred until IPL’s next retail electric base rate case, or other proceeding.which is expected to be filed in the second quarter of 2017 based on a 2016 historical Test Year.

In 2013, the IUB approved the construction of a pipeline for the transportation of natural gas to Marshalltown. AfterIPL began constructing Marshalltown in 2014 after receiving the final necessary regulatory approvals and permits, in the second quarter of 2014, IPL began constructing Marshalltown. IPL currentlyand expects to place Marshalltownthe EGU in service in April 2017. Capital expenditures are currently estimated to be approximately $670 million to construct the second quarter of 2017.EGU and a pipeline to supply natural gas to the EGU, excluding transmission network upgrades and AFUDC.

Marshalltown will replace energy and capacity being eliminated with the planned 2017 retirements of Sutherland Units 1 and 3, Fox Lake Units 1 and 3, Burlington Combustion Turbines Units 1-4, Dubuque Units 3 and 4, Centerville Combustion Turbines Units 1 and 2, and Grinnell Combustion Turbines Units 1 and 2, which in aggregate have a nameplate capacity of approximately 460 MW.

IPL executed an engineering, procurement and construction contract for Marshalltown after a competitive bidding process. In September 2016, Marshalltown’s engineering, procurement and construction contractor announced that costs to construct Marshalltown will exceed its expectations and that it expects to seek compensation from vendors performing work on Marshalltown. IPL does not currently anticipate it will be responsible for these increased costs.

ITC is currently expected to constructconstructing the majority of the required transmission network upgrades for Marshalltown. IPL currently anticipates that ITC willMarshalltown and has elected to pursue an option under the terms of MISO’s Attachment “X” tariff to self-fund these transmission network upgrades. As a result, ITC wouldwill incur the capital expenditures to construct the transmission network upgrades and include a direct charge for such transmission network upgrade costs as part of its electric transmission service costs billed to IPL as the owner of Marshalltown.

Refer to Note 3 for further discussion of Marshalltown.

WPL’s Proposed Construction of the Riverside Expansion - In 2016, WPL currently plans to file a CPCN application withreceived an order from the PSCW in early 2015 for approvalauthorizing WPL to construct an approximate 650730 MW natural gas-fired combined-cycle EGU in Beloit, Wisconsin, referred to as the Riverside expansion. A decision from the PSCW on WPL’s request is currently expected by mid-2016. Construction ofIn 2016, WPL executed a design, engineering, procurement and construction contract for the Riverside expansion is also subject toexpansion. After receiving the receipt of variousfinal necessary regulatory approvals and permits necessaryin the third quarter of 2016, WPL began constructing the Riverside expansion. WPL currently expects to construct and operateplace the EGU. Subject to such approvals, construction is currently expected to beginEGU in 2016 and be completedservice by early 2019. Capital2020. WPL’s estimated portion of capital expenditures are currently estimatedis expected to be approximately $725 million to $775 million$640 million. The capital expenditures include costs to construct the EGU and a pipeline to supply natural gas to the EGU. The estimated capital expendituresEGU, and exclude transmission network upgrades and AFUDC.

The Riverside expansion wouldwill replace energy and capacity being eliminated with the expected2015 retirements of Edgewater Units 3 and 4, Nelson Dewey Units 1 and 2 and Edgewater Unit 3, and the planned retirements of Edgewater Unit 4 and the Rock River and Sheepskin Combustion Turbine Units, which in aggregate have a nameplate capacity of approximately 700 MW.

WPL entered into agreements with neighboring utilities and electric cooperatives that provide each of the neighboring utilities and electric cooperatives options to purchase a partial ownership interest in the Riverside expansion. The purchase price for such options is based on the ownership interest acquired and the net book value of the Riverside expansion on the date of the purchase. The exercise of each option is subject to PSCW approval, and the timing and ownership amounts of the options are as follows:

CounterpartyOption AmountOption Timing
Wisconsin Public Service Corporation (WPSC)up to 200 MW (no more than 100 MW to be acquired in first two years) (a)2020-2024 (b)
Madison Gas and Electric Company (MGE)up to 50 MW (no more than 25 MW to be acquired in first two years)2020-2025 (b)
Electric cooperativesapproximately 65 MWDuring construction of the EGU

(a)If WPSC exercises its options, WPL may exercise reciprocal options, subject to approval by the PSCW, to purchase up to 200 MW of any natural-gas combined-cycle EGU that either WPSC or its affiliated utility, Wisconsin Electric Power Company (Wisconsin Electric), places in service within 10 years of the date the Riverside expansion is placed in service.
(b)Assumes an in-service date in early 2020.

WPSC and MGE Options - In conjunction with the agreements WPL entered into with WPSC and MGE associated with the Riverside expansion, WPL also entered into amendments to the Columbia joint operating agreement. In November 2016, WPL received an order from the PSCW approving amendments to the Columbia joint operating agreement, which allow WPSC and MGE to forgo certain capital expenditures at Columbia. Based on the additional capital expenditures WPL currently expects to incur through June 1, 2020, WPL’s ownership interest in Columbia is expected to increase from 46.2% to 53.4%. Refer to Note 4 for further discussion of these amendments.

In addition to the provisions described above, the agreement WPL entered into with Wisconsin Electric and WPSC provided for the following:

Riverside Expansion Market Participation Date - WPL agreed that the Riverside expansion would not enter the MISO capacity market prior to the date set by MISO for qualifying generation as a capacity asset for the MISO planning year beginning June 1, 2020.
WPL and Wisconsin Electric Capacity Agreement - In the second quarter of 2016, WPL and Wisconsin Electric executed a capacity agreement whereby WPL would purchase specified levels of capacity from Wisconsin Electric from June 1, 2017 through May 2014,31, 2020.
Renewable Generation Joint Development Agreement - In June 2016, WPL, Wisconsin Electric and WPSC executed a separate joint development agreement for the purpose of cooperatively developing any renewable resources greater than 50 MW in Wisconsin for the benefit of their respective customers. The agreement has a 10-year term beginning June 1, 2016, and the utility that originates such renewable resource would hold a majority ownership and operational control of the renewable resource. The other two utilities would have the right to acquire a minority interest in the other utility’s renewable resource.

Electric Cooperatives’ Options - In November 2016, various electric cooperatives, which currently have wholesale power supply agreements with WPL, notified WPL of their intent to exercise options to acquire approximately 65 MW of the Riverside expansion while the EGU is being constructed. Upon exercise of such options, the current wholesale power supply agreements with the various electric cooperatives will be extended by at least four years until 2026 with automatic continuation of such agreements unless terminated by either party, with a five-year notice requirement.

Wind Generation - The strategic plan includes the planned and potential addition of wind generation as follows (in MW). Estimated capital expenditures for the planned and potential wind generation projects for 2017 through 2020 are included in the “Renewable projects” line in the construction and acquisition expenditures table in “Liquidity and Capital Resources.”
  Status IPL WPL
Expansion of wind generation Approved by IUB 500
 N/A
Expansion of wind generation Planned 200
 200
Transfer of Franklin County wind farm assets from AEF to IPL Approved by FERC 99
 N/A

IPL’s Expansion of Wind Generation - In October 2016, IPL and the Iowa Office of Consumer Advocate, among other customer groups, filed a settlement agreement with the IUB regarding the appropriate rate-making principles for up to 500 MW of additional wind generation at IPL. In October 2016, the IUB issued an order approving the settlement agreement, with limited modifications, and establishing rate-making principles, which IPL accepted, as follows:


Up to 500 MW of additional wind generation that qualifies for the full level of production tax credits, regardless of the location in Iowa, with a cost cap of $1,830/kilowatt, including AFUDC and transmission costs. Any costs incurred in excess of this $1,830/kilowatt cost cap are expected to be incorporated into rates if determined to be reasonable and prudent.
A depreciable life of the wind generation of 40 years, unless changed as a result of a contested case before the IUB.
An 11.0% return on common equity, with the exception of certain transmission facilities classified as intangible assets, which would earn the rate of return on common equity the IUB finds reasonable during a future rate case.
A return on common equity for the calculation of AFUDC during the construction period that is the greater of 10.0% or the percentage the IUB finds reasonable during IPL’s next rate case.
The application of double leverage is deferred until IPL’s next retail electric base rate case or other future proceeding.
Amortization over a 10-year period of IPL’s prudently incurred and unreimbursed costs, effective with IPL’s next retail electric base rate case, if IPL cancels the construction of the wind generation.

IPL anticipates placing the 500 MW of additional wind generation in service in 2019 and 2020.

Franklin County Wind Farm - In addition to IPL’s expansion of wind generation discussed above, refer to Note 3 for discussion of a February 2017 FERC order approving the transfer of the 99 MW Franklin County wind farm from AEF to IPL. The Franklin County wind farm began generating electricity in 2012. AEF is currently selling the electricity output from the wind farm into the MISO market as a merchant generator.

IPL’s and WPL’s Potential Expansion of Wind Generation - In addition to IPL’s 500 MW expansion of wind generation and transfer of the 99 MW Franklin County wind farm to IPL in 2017 discussed above, IPL and WPL are each exploring options to own and operate up to 200 MW of additional new wind generation. IPL and WPL currently plan to file the necessary applications for the new wind generation with the IUB and the PSCW, authorizedrespectively, in the third quarter of 2017. Alliant Energy continues to review and evaluate the final amount and timing of this potential additional expansion of wind generation for IPL and WPL, which is subject to defer the retailchange pending further evaluation.

In 2016, IPL and WPL entered into wind turbine supply agreements and made progress payments for a portion of incremental pre-certificationthe wind turbines in such agreements in order to be eligible for the full level of production tax credits from the electricity generated during the first 10 years of operation of future wind projects. IPL and pre-construction costsWPL believe the progress payments in 2016 are sufficient to be eligible for the full level of production tax credits for all 900 MW of new wind generation in its current plan.

IPL has on-going project development associated with approximately 400 MW of wind site capacity in Franklin County, Iowa. Approximately 200 MW of this proposed EGU beginning March 2014.additional site capacity is expected to be included in the future wind expansion. WPL currently estimates deferralhas on-going project development associated with approximately 120 MW of such costs willwind capacity in Freeborn County, Minnesota, which may be further expanded to 200 MW.

Solar Generation - In 2016, WPL began providing customers with energy from the 2.3 MW Rock River solar project through a 10-year PPA. The solar field is located at WPL’s Rock River landfill site in Beloit, Wisconsin. In 2017, IPL expects to install approximately $11 million6 MW of solar arrays in aggregate by December 31, 2015.Dubuque, Iowa.

Coal-Fired Generation -
EmissionEnvironmental Controls Projects - The strategic plan includes new emissionadding environmental controls at newer, larger and more efficient coal-fired EGUs to continue producing affordable energy for customers and to benefit the environment. Current projects include installing SCRs at IPL’s Ottumwa Unit 1 and WPL’s Columbia Unit 2 to achieve compliance obligations under CSAPR and the Consent Decrees. SCR is a post-combustion process that injects ammonia or urea into the stream of gases leaving the EGU boiler to convert NOx emissions into nitrogen and water. The use of a catalyst enhances the effectiveness of the conversion, enabling NOx emissions reductions of up to 90%. Refer to “Environmental Compliance Plans” belowNote 16(e) for detailsdiscussion of the Consent Decrees.

IPL - Under Iowa law, IPL is required to file an EPB biennially. Filing of periodic reports regarding these emissionthe implementation of IPL’s compliance plan and related budget identified in an EPB is also currently required under a settlement agreement between IPL and the Iowa Office of Consumer Advocate, among others. An EPB provides a utility’s compliance plan and related budget for managing regulated emissions from its coal-fired EGUs in a cost-effective manner. IUB approval of an EPB demonstrates that the EPB is reasonably expected to achieve cost-effective compliance with applicable state environmental requirements. In April 2016, IPL filed its most recent EPB with the IUB, which includes the SCR for Ottumwa Unit 1. A decision from the IUB is currently expected in 2017. The SCR at Ottumwa Unit 1 is currently expected to be placed in service in 2018, with an estimated total project cost of $65 million to $80 million.


WPL - WPL must file a CA application and receive authorization from the PSCW to proceed with any individual environmental controls projects includingproject with an estimated project cost of $10.7 million or more. WPL is currently constructing the capital expendituresSCR at Columbia Unit 2 pursuant to a 2015 PSCW order and expects to place it in 2015 throughservice in 2018, currently anticipated for these projects. with an estimated total (past and future) project cost of $40 million to $60 million. Refer to Note 3 for discussion of individual emission controls projects placeda scrubber and baghouse project at WPL’s Edgewater Unit 5, which was completed in service in 2014.July 2016.

Generation Improvement Projects - The strategic plan includes investments in generation maintenance and performance improvements at newer, larger and more efficient coal-fired EGUs, including WPL’s Edgewater Unit 5 and Columbia Units 1 and 2. Refer to “Liquidity and Capital Resources” for details regarding estimated capital expenditures in 2015 through 2018 for these generation maintenance and performance improvement projects. Construction of IPL’s Ottumwa Unit 1 generation maintenance and performance improvements was completed in 2014.

Columbia Units 1 and 2 - In January 2014,2015, WPL received an order from the PSCW approving a request forbegan constructing generation maintenance and performance improvements at Columbia Units 1 and 2.2, pursuant to PSCW orders. WPL’s portion of the total capital expenditures for the projects, excluding AFUDC, is currently estimated to be between $55$70 million and $65$80 million. WPL currently expects to begin construction inplace the first half of 2015 and place thevarious projects in service by the end of 2017.


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Estimated capital expenditures for the environmental controls and generation improvement projects for 2017 through 2020 are included in the “Generation - Other” line in the construction and acquisition expenditures table in “TableLiquidity and Capital Resources.” Such estimates represent IPL’s or WPL’s respective portion of Contentsthe total escalated capital expenditures and exclude AFUDC, if applicable. Capital expenditure estimates are subject to change based on future changes to plant-specific costs of environmental controls technologies and environmental requirements.


Plant Retirements orand Fuel Switching - The current strategic plan includes the retirement, or fuel switch from coal to natural gas, of several older, smaller and less efficient EGUs in the next few yearsseveral years. The plan includes the following EGUs, with net book values as follows:of December 31, 2016 (dollars in millions; Combustion Turbine (CT)). Refer to “Properties” in Item 2 for additional details, including nameplate capacity.
EGU (In-Service Year)Nameplate Capacity (a)Expected Action (b)
IPL:
Dubuque Units 3 and 4 (1952-1959)66 MWRetire by December 31, 2016 (c)
Fox Lake Unit 1 (1950)11 MWRetire by December 31, 2017
Fox Lake Unit 3 (1962)82 MWRetire by December 31, 2017 (c) (d)
Sutherland Units 1 and 3 (1955-1961)119 MWRetire by December 31, 2017 (d)
Other unitsApproximately 200 MWRetire by December 31, 2017 (d)
WPL:
Edgewater Unit 3 (1951)69 MWRetire by December 31, 2015 (e)
Nelson Dewey Units 1 and 2 (1959-1962)227 MWRetire by December 31, 2015 (e)
Edgewater Unit 4 (1969)239 MW (f)Retire by December 31, 2018 (g)
Rock River Combustion Turbine Units 3-6 (1967-1972)169 MWRetire by December 31, 2019 (g)
Sheepskin Combustion Turbine Unit 1 (1971)42 MWRetire by December 31, 2019 (g)

(a)Nameplate capacity represents the nominal amount of electricity an EGU is designed to produce. Each EGU is also assessed a generating capacity amount from MISO through its annual resource adequacy process. The generating capacity amount assessed by MISO is subject to change each year and is based upon the current performance capability of the EGU and is based on historical forced outages.
(b)
As of December 31, 2014, the aggregate net book value of EGUs that may be retired in the future in the table above was $57 million for IPL and $88 million for WPL.
(c)IPL received approval from MISO to retire Dubuque Units 3 and 4, contingent on completion of transmission network upgrades necessary for system reliability. Final MISO studies could indicate that the retirement of Fox Lake Unit 3 may result in reliability issues and that transmission network upgrades for system reliability are necessary to enable such retirements. Under the current MISO tariff, the specific timing for the retirement of these EGUs could depend on the timing of the required transmission network upgrades as well as various operational, market and other factors.
(d)The retirements of Fox Lake Unit 3, Sutherland Units 1 and 3, and other units are contingent on the construction of Marshalltown as well as various operational, market and other factors.
(e)WPL received approval from MISO to retire Edgewater Unit 3, and Nelson Dewey Units 1 and 2, contingent on completion of transmission network upgrades necessary for system reliability.
(f)Reflects WPL’s 68.2% ownership interest in Edgewater Unit 4.
(g)The retirements of Edgewater Unit 4 and the Rock River and Sheepskin Combustion Turbine Units are contingent on the construction of the Riverside expansion as well as various operational, market and other factors.

In addition, IPL’s M.L. Kapp Unit 2, which was placed in service in 1967 and has a nameplate capacity of 218 MW, is expected to switch from coal to natural gas as its only fuel type in 2015, contingent on approval from MISO.
IPL WPL
  Expected Net Book   Expected Net Book
EGU Action Value EGU Action Value
Sutherland Units 1 and 3 Retire by 6/30/17 
$43
 Edgewater Unit 4 Retire by 12/31/18 
$37
Dubuque Units 3 and 4 Retire by 6/30/17 5
 Rock River CT Units 3-6 Retire by 12/31/20 2
Prairie Creek Unit 4 Fuel switch by 12/31/17 52
 Sheepskin CT Unit 1 Retire by 12/31/20 
Marshalltown CT Units 1-3 Fuel switch by 12/31/17 4
      
Fox Lake Unit 1 and 3 Retire by 12/31/17 2
      
Other units Retire by 12/31/17 1
      
Red Cedar CT Unit 1 Retire by 12/31/18 4
      
Burlington Unit 1 Fuel switch by 12/31/21 62
      
Prairie Creek Units 1 and 3 Fuel switch or retire by 12/31/25 94
      

Alliant Energy, IPL and WPL are working with MISO, state regulatory commissions and other regulatory agencies, as required, to determine the final timing of these actions. The expected dates for the retirement and fuel switching of these EGUs are subject to change depending on operational, regulatory, market and other factors. The potential retirement of other EGUs within the generation fleet continues to be evaluated.

Nuclear Generation -
IPL’s DAEC PPA - In 2013, the IUB issued an order allowing IPL to proceed with a PPA for the purchase of capacityElectric and energy generated by DAEC located near Palo, Iowa. The IUB also authorized IPL to recover the Iowa retail portion of the cost of the DAEC PPA from Iowa retail electric customers through the energy adjustment clause. The terms of the PPA provide IPL the right to the counterparty’s entire output quantities (70% of the total plant output) in exchange for payment from IPL to the counterparty based on the amount of MWhs received by IPL. IPL will purchase up to 431 MWs of capacity and the resulting energy from DAEC for a term from February 22, 2014 through December 31, 2025. Among the terms and conditions of the PPA are guarantees by the counterparty to provide minimum amounts of capacity and energy. The PPA also contains provisions for the replacement of energy from alternative sources under certain conditions as well as provisions that convey to IPL the potential environmental attributes associated with its portion of the output from DAEC. Refer to “Rate Matters” for further discussion of the IUB’s 2013 order approving the DAEC PPA.


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Wind Generation -
Resources’ Franklin County Wind Project - The Franklin County wind project began generating electricity in 2012. Resources is currently selling the electricity output from the wind project into the MISO market as a merchant generator, and is considering different options for this wind project. Such options include entering into a PPA with an independent third party, IPL or WPL; selling the project to an independent third party, IPL or WPL; or continuing to sell the output into the MISO market as a merchant generator. Refer to Note 3 for further discussion of the Franklin County wind project.

Undeveloped Wind Sites - IPL has up to 400 MW of wind site capacity remaining in Franklin County, Iowa. WPL has approximately 200 MW of wind site capacity remaining in Freeborn County, Minnesota. Future development of the balance of these wind sites will depend on numerous factors such as changes in customer demand, RPS, environmental requirements, electricity and fossil fuel prices, wind project costs, technology advancements and transmission capabilities.

Gas Distribution Systems - The Pipelinestrategic plan includes investments targeted at replacing, modernizing and Hazardous Materials Safety Administration is expected to expand and/or strengthen regulations related to naturalupgrading aging infrastructure in the electric and gas transmission and distribution systems in 2015. These changes are expected to help ensure natural gas transmission and distribution systems are properly maintained and operated safely. These changes are also expected to result in more inspections and potential replacement of certain portions of Alliant Energy’s, IPL’s and WPL’s natural gas transmission and distribution systems. In addition, Alliant Energy, IPL and WPL are currently extending various natural gas transmission and distribution systems in their existing Iowa and Wisconsin service territories to serve new customer demand. Estimated capital expenditures for these expected and current electric and gas distribution infrastructure projects for 20152017 through 20182020 are included in the “Gas distribution“Electric and gas distributions systems” linelines in the construction and acquisition expenditures table in “Liquidity and Capital Resources.”

Utility Business Divestitures -
IPL’s Minnesota Electric and Natural Gas Distribution AssetsPipeline Expansion - ReferIPL currently expects to Note 3 for discussion ofplace the MPUC’s order approving the proposed sale of IPL’s MinnesotaClinton natural gas distribution assets, as well as thepipeline, located in Scott and Clinton Counties in Iowa, which provides capacity for anticipated sale of IPL’s Minnesota electric distribution assets. Alliant Energy and IPL currently do not expect the sales of these assets to have a significant impact on their earnings for 2015.customer growth in Clinton County, into service in March 2017.

Environmental Compliance PlansPipeline and Hazardous Materials Safety Administration - - Environmental compliance plans have been developedIn April 2016, the Pipeline and Hazardous Materials Safety Administration published proposed regulations to help ensure cost effective complianceupdate safety requirements for gas transmission pipelines, which would add new assessment and repair criteria for gas pipelines, and require a systematic approach to verify a pipeline’s maximum allowable operating pressure. Alliant Energy, IPL and WPL currently anticipate final regulations will be issued in 2017. Given that the Pipeline and Hazardous Materials Safety Administration has not finalized these gas transmission regulations, Alliant Energy, IPL and WPL are currently unable to predict with current and proposed environmental laws and regulations. Significant reductions of future emissions of NOx, SO2, PM, mercury and other HAPs at EGUs are expected to be required as a resultcertainty the impact of these environmental lawsregulations on their financial condition and regulations. Environmental compliance plans are reviewed and updated to address various external factors, as deemed necessary and in accordance with regulatory requirements. Someresults of operations. In anticipation of these external factors include regulatory decisions regarding proposed emission controls projects, developments related to environmental regulations, outcomes of legal proceedings, settlements reached with environmental agenciespending rule changes, Alliant Energy, IPL and citizens groups, availability and cost effectiveness of different emission reduction technologies, market prices for electricity and fossil fuels, market prices for emission allowances, market conditions for obtaining financings, and federal and state tax incentives. Refer to “Environmental Matters” for details ofWPL have started proactively replacing certain current and proposed environmental regulations, including regulations for which these compliance plans are expected to support. The following table provides current estimates of capital expenditures planned for 2015 through 2018 as well as the total (past and future) project costs for certain emission controls projects included in current environmental compliance plans (in millions):
  Expected           Total
Generating Unit In-service Date Technology (a) 2015 2016 2017 2018 Project Cost
IPL:              
Lansing Unit 4 2015 Scrubber 
$15
 
$—
 
$—
 
$—
 $50-$60
WPL:              
Edgewater Unit 5 2016 Scrubber & Baghouse 120
 60
 
 
 280-320
Columbia Unit 2 2018 SCR 15
 20
 25
 10
 60-80

(a)
Scrubber is a post-combustion process that injects lime or lime slurry into the stream of gases leaving the EGU boiler to remove SO2 and other acid gases (including hydrochloric acid) and capture them in a solid or liquid waste by-product. A scrubber typically removes more than 90% of the SO2 emissions.
Baghouse, including carbon injection, is a post-combustion process that injects carbon particles into the stream of gases leaving the EGU boiler to facilitate the capture of mercury in filters or bags. This process can remove more than 85% of mercury emissions.
SCR is a post-combustion process that injects ammonia or urea into the stream of gases leaving the EGU boiler to convert NOx emissions into nitrogen and water. The use of a catalyst enhances the effectiveness of the conversion, enabling NOx emissions reductions of up to 90%.

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These capital expenditure estimates represent IPL’s or WPL’s respective portion of the total escalated capital expenditures and exclude AFUDC, if applicable. Capital expenditure estimates are subject to change based on future changes to plant-specific costs of emission controls technologies and environmental requirements.

IPL’s Emission Controls Projects - Under Iowa law, IPL is required to file an EPB biennially. Filing of periodic reports regarding the implementation of IPL’s compliance plantransmission pipelines and related budget identified in an EPB is also currently required under a settlement agreement between IPL and the Iowa Officemaking modifications to certain of Consumer Advocate. An EPB provides a utility’s compliance plan and related budget for managing regulated emissions from its coal-fired EGUs in a cost-effective manner. IUB approval of an EPB demonstrates that the IUB believes the EPB is reasonably expected to achieve cost-effective compliance with applicable state environmental requirements. In February 2013, the IUB approved IPL’s EPB, which includes the emission controls project for Lansing Unit 4 listed in the above table. Alliant Energy and IPL currently expect the IUB to issue its decision by mid-2015 on an updated EPB, which also includes the emission controls project for Lansing Unit 4 listed in the above table.WPL’s transmission pipelines.

Lansing Unit 4Advanced Metering Infrastructure (AMI) - - IPL currently plans to install AMI in its electric and gas service territories in Iowa through a phased approach from 2017 through 2019. AMI is constructing a scrubber at Lansing Unit 4 to reduce SO2 emissions at the EGU. The scrubber at Lansing Unit 4system of meters, communications networks and data management systems that enables two-way communication between utilities and its customers. AMI allows for remote meter reading, automatic outage notification, and remote disconnects and reconnects. AMI technology is expected to support compliance obligations for currentimprove customer service, enhance energy management initiatives and anticipated air quality regulatory requirements, including CSAPR.provide operational savings through increased efficiencies.

WPL’s Emission Controls ProjectsNon-regulated Operations - WPL must fileThe strategic plan for Alliant Energy’s non-regulated operations involves maintaining a CA applicationmodest portfolio of businesses that are accretive to earnings and receive authorization from the PSCW to proceed with any individual emission controls project with an estimated project costcash flows but not significant users of $10 million or more.capital.

Edgewater Unit 5 - In June 2013, WPL received an order from the PSCW approving WPL’s CA application to install a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions at the EGU. The scrubber and baghouse are expected to support compliance obligations under the MATS Rule and CSAPR, as well as the Consent Decree entered into with the EPA and the Sierra Club in 2013.

Columbia Unit 2 - In January 2015, WPL received an order from the PSCW approving WPL’s CA application to install an SCR system at Columbia Unit 2 to reduce NOx emissions at the EGU. The SCR is expected to support compliance obligations for current and anticipated air quality requirements, including CSAPR and requirements under the Consent Decree referenced above.

Refer to Note 16(e) for discussion of a Consent Decree approved by the Court in 2013, which includes a requirement for WPL to install emission controls systems noted above at certain of its EGUs.

Energy Efficiency Programs - Several energy efficiency programs and initiatives help customers reduce their energy usage and related costs through the use of new energy efficient equipment, products and practices. The following are current key energy efficiency programs:

IPL EEP - In 2013, IPL received an order from the IUB approving IPL’s EEP for 2014 through 2018. The EEP includes IPL spending approximately $400 million for electric and natural gas energy efficiency programs in Iowa from 2014 through 2018, and is expected to conserve electric and natural gas usage equal to that of more than 100,000 homes. In accordance with Iowa law, IPL is required to file an EEP every five years. An EEP provides a utility’s plan and related budget to achieve specified levels of energy savings. IUB approval demonstrates that the IUB believes that IPL’s EEP is reasonably expected to achieve cost effective delivery of the energy efficiency programs. To the extent approved by the IUB, costs associated with executing the EEP are recovered from ratepayers through an additional tariff called an EECR factor. The EECR factors are revised annually and include a reconciliation to eliminate any over- or under-recovery of energy efficiency expenses from prior periods. There are no carrying costs associated with the cost recovery factors. The annual EECR factors are based on IPL’s approved budget as filed with its EEP, along with any over- or under-collection from prior periods, and therefore are not expected to have a material impact on Alliant Energy’s and IPL’s financial condition or results of operations.

Focus on Energy Program - In 2014 and 2013, WPL contributed 1.2% of annual utility revenues to help fund Focus on Energy, Wisconsin’s state-wide energy efficiency and renewable energy resource program.


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RATE MATTERS

Overview - Alliant Energy has two utility subsidiaries, IPL and WPL. IPL and WPL are subject to federal regulation by FERC, which has jurisdiction over wholesale electric rates and certain natural gas facilities, and state regulation in Iowa Wisconsin and MinnesotaWisconsin for retail utility rates and standards of service. Such regulatory oversight also covers IPL’s and WPL’s plans for construction and financing of new EGUs and related activities.

Retail Base Rate Filings - DetailsBase rate changes reflect both returns on additions to infrastructure and recovery of IPL’s and WPL’s recent retail basechanges in costs incurred or expected to be incurred. Given that a portion of the rate cases impacting historical and future results of operations are as follows (dollarschanges will offset changes in millions; Electric (E); Gas (G)):costs, revenues from rate changes should not be expected to result in an equal change in net income for either IPL or WPL.
Retail Base Rate Cases 
Utility
Type
 
Filing
Date
 
Interim Increase
Implemented (a)(b)
 
Interim
Effective
Date
 
Final
Increase / (Decrease)
Granted (b)
 
Final
Effective Date
WPL:            
Wisconsin 2015/2016 Test Period E/G Apr-14 N/A
 N/A E-$0;G-($5) Jan-15
Wisconsin 2013/2014 Test Period E/G May-12 N/A
 N/A E-$0;G-($13) Jan-13
IPL:            
Iowa 2011 Test Year G May-12 
$9
 Jun-12 
$11
 Jan-13

(a)In Iowa, IPL’s interim rates can be implemented 10 days after the filing date, without regulatory review and are subject to refund, pending determination of final rates. In Minnesota, IPL’s interim rates can be implemented 60 days after the filing date, with regulatory review and are subject to refund, pending determination of final rates. The amount of the interim rates is replaced by the amount of final rates once the final rates are effective.
(b)Base rate changes reflect both returns on additions to infrastructure and recovery of changes in costs incurred or expected to be incurred. Given that a portion of the rate changes will offset changes in costs, revenues from rate changes should not be expected to result in an equal change in net income for either IPL or WPL.

WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016(2017/2018 Test Period) - In July 2014, December 2016,WPL received an order from the PSCW authorizing WPL to maintainimplement an increase in annual retail electric rates of $9 million, or approximately 1%, and an increase in annual retail gas rates of $9 million, or approximately 13%. The $9 million net annual retail electric rate increase reflects a $60 million increase in base rates, at their current levelspartially offset by a $51 million reduction in fuel-related costs, using an estimate for 2017 fuel-related costs. These increases are effective January 1, 2017 and extend through the end of 2016.2018. The retail electric base rate case included a returnincreases reflect recovery of and a return onthe costs for emissionenvironmental controls projects at Edgewater and Columbia, Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements at Columbia Units 1 and 2, other ongoing capital expenditures, and an increaseinvestments in electric transmission service expense. The additional revenue requirement for these costand gas distribution systems, including expansion of natural gas pipeline infrastructure. These rate increases waswere partially offset by the impactutilization of changes in the amortization of regulatory liabilities associated withamounts that WPL previously over-recovered from its customers for energy efficiency cost recoveriesrecovery and increased sales volumes. The order also authorizes WPL to implement a $5 million decrease in annual retail gas base rates effective January 1, 2015 followed by a freeze of such gas base rates throughelectric transmission cost recovery, as well as amounts deferred under the end of 2016.

The order requires escrow treatment of major transmission charges, allows continuation of an 8.2% AFUDC recovery rate, and allows continuation of a 10.4% return on common equity sharing mechanism for the 2013/2014 Test Period. The order included a return on common equity of 10.0% and the following related provisions: (1) WPL may requestcontinues a change in retail base rates during the test period if its annual regulatory return on common equity falls below 8.5%; and (2)sharing mechanism, whereby WPL must defer a portion of its earnings if its annual regulatory return on common equity exceeds 10.65%10.25% during the test period.2017 and 2018 Test Period. WPL must defer 50% of its excess earnings between 10.65%10.25% and 11.40%11.00%, and 100% of any excess earnings above 11.40%11.00%. In addition, the order allows WPL to maintain its ability to request deferrals based on current practices.

Refer to Note 2 for discussion of WPL’s retail fuel-related filing for 2015. The fuel-related cost component of WPL’s retail electric rates for 2016 will be addressed in a separate filing. Refer to Note 7 for details of WPL’s regulatory limitation on distributions of common stock dividends to its parent company in 2017 and 2018.

The order reflected the impact of the transfer of WPL’s investment in ATC to ATI on December 31, 2016 as discussed in Note 6(a), approved changes to depreciation rates pursuant to a September 2016 PSCW order, continued escrow treatment of transmission and energy conservation charges, and application of AFUDC rates to 100% of the retail portion of the CWIP balances for the Riverside expansion. The order also requires deferral of any potential changes in revenue requirement due to anticipated increases in WPL’s ownership share of Columbia resulting from the Riverside expansion agreements WPL previously entered into with neighboring utilities. The order also approved changes to retail rates, which result in a higher percentage of costs being recovered from customers through fixed and demand charges.

The fuel-related cost component of WPL’s retail electric rates for 2018 will be addressed in a separate filing, which is currently expected to be filed in the second or third quarter of 2017.

WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016 Test Period) - Refer to Note 2 for details of a July 2014 PSCW order, which included a provision that required WPL to defer a portion of its earnings if its annual regulatory return on common equity exceeded 10.65% during 2015 and 2016. As of December 31, 2016, Alliant Energy and WPL deferred $6 million of WPL’s 2016 earnings for this provision, which WPL currently expects will be refunded to its customers in a future rate case or other proceeding.

WPLs Wisconsin Retail Electric and Gas Rate Case (2013/2014 Test Period) - InRefer to Note 2 for details of a July 2012 WPL received anPSCW order, from the PSCW authorizing WPL to implement a decrease in annual retail gas base rates of $13 million effective January 1, 2013 followed by a freeze of such gas base rates through the end of 2014. The order also authorized WPL to maintain retail electric base rates at their current levels through the end of 2014. Recovery of the costs for the acquisition of Riverside, the SCR project at Edgewater Unit 5 and the scrubber and baghouse projects at Columbia Units 1 and 2 werewhich included in the request. The recovery of the costs for these capital projects were offset by decreases in rate base resulting from increased net deferred tax liabilities, the impact of changes in the amortizations of regulatory assets and regulatory liabilities, and the reduction of capacity payments. The order included continuation of a 10.4% return on common equity and a provision that required WPL to defer a portion of its earnings if its annual regulatory return on common equity exceedsexceeded 10.65% during the test period. The amount of earnings WPL must defer is equal to 50% of its excess earnings between 10.66%2013 and 11.40% and 100% of any excess earnings above 11.40%.2014. As of December 31, 2014,2016, Alliant Energy and WPL deferred $9$6 million of WPL’s 2013 and 2014 earnings for this provision.

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Referprovision, which is being returned to Note 2 for details of WPL’scustomers as an offset to revenue requirements in the 2017/2018 Test Period retail fuel-related filings for 2013 and 2014 and details of impacts to “Regulatory assets” on Alliant Energy’s and WPL’s balance sheets from the PSCW’s July 2012 order.rate case discussed above.

IPLs Iowa Retail Gas Rate Case (2011 Test Year) - In May 2012, IPL filed a request with the IUB to increase annual rates for its Iowa retail gas customers based on a 2011 historical test year as adjusted for certain known and measurable changes occurring up to 12 months after the commencement of the proceeding. The key drivers for the filing included recovery of capital investments since IPL’s last Iowa retail gas rate case filed in 2005. In conjunction with the filing, IPL implemented an interim retail gas rate increase of $9 million, or approximately 3%, on an annual basis, effective June 4, 2012.

In November 2012, the IUB approved a settlement agreement between IPL, the Iowa Office of Consumer Advocate and the Iowa Consumers Coalition related to IPL’s request resulting in a final increase in annual rates for IPL’s Iowa retail gas customers of $11 million, or approximately 4%, effective January 10, 2013, a 9.6% return on common equity after the application of double leverage and the adoption of IPL’s gas tax benefit rider discussed below.

IPL’s Iowa Retail Electric Rate Settlement Agreement - In January 2013, the IUB issued an order allowing IPL to proceed with its DAEC PPA for a term of February 22, 2014 through December 31, 2025 and authorized IPL to recover the Iowa retail portion of the costs of such PPA from Iowa retail electric customers through the energy adjustment clause beginning February 22, 2014. The January 2013 order encouraged IPL to continue discussions with parties to the DAEC PPA proceeding to reach an agreement to resolve concerns expressed by such parties during the proceeding regarding rate impacts for IPL’s Iowa retail electric customers beginning in 2014.

In September 2014, the IUB approved a settlement agreement which was based on a unanimous agreement among partiesin 2014 related to the DAEC PPA proceeding.rates charged to IPL’s Iowa retail electric customers. The settlement agreement extendsextended IPL’s Iowa retail electric base rates authorized in its 2009 test yearTest Year rate case through 2016 and providesprovided targeted retail electric customer billing credits of $105 million in aggregate, including targeting $70 million in 2014 (beginning May 2014), $25 million inaggregate. In 2016, 2015 and $10 million in 2016. In 2014, IPL recorded $9 million, $24 million and $72 million of such retail electric customer billing credits. IPL will make adjustments to future billing credits, to provide retail electric customer billing credits of $105 million in aggregate.respectively. The settlement agreement included the continuation of the energy adjustment clause, transmission cost rider and electric tax benefit rider credits; the ability for IPL to seek rate relief if a significant event occurs; and the ability for parties to the DAEC PPA proceeding to request show cause action if IPL’s Iowa retail electric return on common equity exceedsexceeded 11% for 2014, 2015 or 2016.

Items considered in settlement discussions included costs for emissionenvironmental controls at Ottumwa Unit 1, George Neal Units 3 and 4, Burlington Unit 1 and Prairie Creek Units 3 and 4, generation performance and reliability improvements at Ottumwa Unit 1, and other ongoing capital expenditures; the elimination of purchased electric capacity payments from the previous DAEC PPA that ended in February 2014; and costs of the new DAEC PPA. IPL assumesassumed no change to its current authorized return on common equity and common equity component of the regulatory capital structure authorized in its 2009 test yearTest Year case.

WPL’s Retail Fuel-related Rate Filings - Refer to Note 2 for discussion of WPL’s retail fuel-related rate filings for test years 2012Test Years 2014 through 2015.2016.

WPL’s Depreciation Study - In September 2016, the PSCW issued an order approving the implementation of updated depreciation rates for WPL effective January 1, 2017 as a result of a recently completed depreciation study. The September 2016 PSCW order also authorized WPL to recover the remaining net book value of Edgewater Unit 4 over a 10-year period beginning the later of the retirement date of the EGU or January 1, 2019. In December 2016, FERC issued an order approving the implementation and inclusion of the updated depreciation rates in WPL’s wholesale formula rates effective January 1, 2017.

IPL’s Tax Benefit Riders - In 2009, IPL filed a request with theThe IUB to create a regulatory liability account for potential tax benefits resulting from changes in tax accounting methodologieshas approved electric and tax elections available under the Internal Revenue Code. These potential tax benefits are related to the tax treatment of repairs expenditures, allocation of insurance proceeds from floods in 2008 and allocation of mixed service costs. In 2012, IPL filed a report with the IUB requesting approval of the final amount of the regulatory liability account based on the tax benefits generated from these changes in tax accounting methodologies and tax elections that were sustained under IRS audit. The 2012 report filed by IPL identified approximately $500 million of such tax benefits, which included $452 million allocated for use with the electric tax benefit rider and $48 million allocated for use with the gas tax benefit rider discussed below. Refer to “Property Method Changes” below for discussion of additionalriders proposed by IPL, which utilize regulatory liabilities generated from tax benefits recorded in 2014 from two additional tax accounting method changes implemented in 2014.

Electric - The electric tax benefit rider, which was approved by the IUB and implemented in 2011, utilizes amounts from the regulatory liability account to credit bills of IPL’s Iowa retail electric customers (beginning in 2011) and gas customers (beginning in 2013) to help offset the impact of rate increases on such customers. These credits on customers’ electric bills reduce electric revenues based on customers’ KWh usage. In December 2014, the IUB issued an order authorizing $75 million of regulatory liabilities from tax benefits to be credited to IPL’s retail electric customers’ bills in Iowa during 2015 through the electric tax benefit rider. In December 2014, the IUB also authorized IPL to reduce the $75 million of billing credits on customers’ bills by $15 million in 2015 to recognize the revenue

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requirement impact of the changes in tax accounting methods. IPL expects the IUB will approve distribution of any remaining benefits in 2016 and 2017.

Gas - IPL’s May 2012 retail gas rate case filing with the IUB included a proposal to utilize regulatory liabilities to credit bills of Iowa retail gas customers to help mitigate the impact of the proposed final rate increase on such customers. These credits on customers’ gas bills reduce gas revenues based on a fixed amount per day. In November 2012, IPL received an order from the IUB authorizing the gas tax benefit rider. The IUB’s order authorized approximately $12 million of regulatory liabilities from tax benefits to be credited to IPL’s retail gas customers’ bills in Iowa annually from January 2013 through December 2015 through the gas tax benefit rider. Any remaining benefit, including any portion not utilized of the agreed upon amount from January 2013 through December 2015, is expected to be credited to Iowa’s retail gas customers’ bills in 2016.

Utilization of Tax Benefit Riders - IPL’s tax benefit riders regulatory liability account has been, and plans to be, utilized to credit bills of Iowa retail electric and gas customers as follows:
 Electric Gas Total
Regulatory liability account balance approved by IUB
$452
 
$48
 
$500
2011 through 2014 customer billing credits(308) (23) (331)
2015 customer billing credits (estimate)(75) (12) (87)
Remaining balance available for future periods
$69
 
$13
 
$82

Property Method Changes - Refer to Note 2 for discussion of $75 million of additional tax benefits recorded in 2014 in another regulatory liability account from two additional tax accounting method changes implemented in 2014, which IPL currently anticipates refunding to its Iowa retail electric and gas customers in the future.
 Electric Gas Total
Regulatory liability account balance approved by IUB
$520
 
$55
 
$575
2011 through 2016 customer billing credits(444) (47) (491)
2017 customer billing credits (estimate)(76) (8) (84)
Remaining balance available for future periods
$—
 
$—
 
$—

Refer to Notes 2 and 11 for additional discussion of the impacts of the electric and gas tax benefit riders on Alliant Energy’s and IPL’s regulatory assets and regulatory liabilities, income tax expense and effective income tax rates.

Planned Utility Rate Case -
IPL’s Iowa Retail Electric Rate Case (2016 Test Year) - IPL currently expects to make a retail electric rate filing in the second quarter of 2017 based on a 2016 historical Test Year. The key drivers for the anticipated filing include recovery of capital projects, including Marshalltown, power grid modernization and investments that advance clean energy. Any rate changes are expected to be implemented in two phases with interim rates effective approximately 10 days after the filing and final rates effective after IUB approval. The IUB must decide on requests for retail rate changes within 10 months of the date of the application for which changes are filed, or the interim rates granted become permanent.


Rate Case Details - Details of the currently effective rate orders in IPL’s and WPL’s key jurisdictions were as follows (Common Equity (CE); Preferred Equity (PE); Long-term Debt (LD); Short-term Debt (SD)):
 Authorized Return Average Authorized Return Average
 Test on Common Regulatory Capital Structure After-tax Rate Base Test on Common Regulatory Capital Structure After-tax Rate Base
Jurisdictions Period/Year Equity (a) CE PE LD SD WACC (in millions) Period/Year Equity (a) CE PE LD SD WACC (in millions)
IPL:                                
Iowa retail (IUB):      
Electric:      
- Emery (b) 2009 11.58% 48.2% 6.5% 45.3% N/A 8.85% $281 (c) 2009 11.58% 48.2% 6.5% 45.3% N/A 8.85% $281 (c)
- Whispering Willow - East (b) 2009 11.09% 48.2% 6.5% 45.3% N/A 8.61% 266 (c) 2009 11.09% 48.2% 6.5% 45.3% N/A 8.61% 266 (c)
- Other (b) 2009 9.53% 48.2% 6.5% 45.3% N/A 7.86% 1,843 (c) 2009 9.53% 48.2% 6.5% 45.3% N/A 7.86% 1,843 (c)
Gas (d) 2011 9.56% 48.8% 5.0% 46.2% N/A 7.76% 255 (c) 2011 9.56% 48.8% 5.0% 46.2% N/A 7.76% 255 (c)
Minnesota retail (MPUC):   
Electric 2009 10.35% 47.7% 6.3% 43.9% 2.1% 8.11% 126 (e)(f)
Gas 1994 10.75% 41.0% 7.4% 44.0% 7.6% 8.82% 7 (f)
Wholesale electric (FERC) (g) 2014 10.97% 47.9% 5.5% 46.7% N/A 7.95% 39 (h)
Wholesale electric (FERC) (e) 2016 10.97% 47.8% 5.0% 47.2% N/A 7.90% 119 (f)
WPL:      
Wisconsin retail (PSCW):      
Electric 2015 10.40% 50.5% N/A 48.9% 0.6% 7.90% 2,329 (i) 2017 10.00% 52.2% N/A 43.9% 3.9% 7.57% 2,699 (g)
Electric 2016 10.40% 51.0% N/A 46.2% 2.8% 7.84% 2,450 (i) 2018 10.00% 52.2% N/A 45.2% 2.6% 7.59% 2,851 (g)
Gas 2015 10.40% 50.5% N/A 48.9% 0.6% 7.90% 201 (i) 2017 10.00% 52.2% N/A 43.9% 3.9% 7.57% 259 (g)
Gas 2016 10.40% 51.0% N/A 46.2% 2.8% 7.84% 204 (i) 2018 10.00% 52.2% N/A 45.2% 2.6% 7.59% 284 (g)
Wholesale electric (FERC) (j) 2014 10.90% 55.0% N/A 45.0% N/A 8.45% 274 (k)
Wholesale electric (FERC) (h) 2016 10.90% 55.0% N/A 45.0% N/A 8.39% 299 (f)


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(a)Authorized returns on common equity may not be indicative of actual returns earned or projections of future returns.
(b)Authorized returns on common equity and after-tax WACC reflect application of double leverage pursuant to a January 2011 IUB order. Prior to the application of double leverage, authorized returns on common equity were: Emery-12.23%, Whispering Willow-East-11.7% and Other-10.0%, and after-tax WACC were: Emery-9.16%, Whispering Willow-East-8.91% and Other-8.09%.
(c)Average rate base iswas calculated using a 13-month averagebalances as of the end of the test year, adjusted for post-test year capital additions placed in service by September 30 following the end of the test year.
(d)Authorized returns on common equity and after-tax WACC reflect application of double leverage pursuant to the unanimous settlement agreement approved in the IUB’s November 2012 order. Prior to the application of double leverage, authorized return on common equity was 10.0% and after-tax WACC was 8.0%.
(e)
Average rate base amounts do not include Whispering Willow - East capital costs, which are currently being recovered through a temporary renewable energy rider approved by the MPUC. Refer to Note 3 for details of the final recovery amount of the Whispering Willow - East capital costs.
(f)Average rate base is calculated using a 13-month average adjusted for certain post-test year capital additions.
(g)IPL’s wholesale formula rates reflect annual changes in CE, PE, LD, WACC and rate base.
(h)(f)IPL’s wholesaleWholesale average rate base reflects production-related rate base calculated as the simple average of the beginning of the test year and end of the test year balances in accordance with IPL’sthe respectively approved formula rates.
(i)(g)Average rate base amounts do not include CWIP or a cash working capital allowance and arewere calculated using a forecasted 13-month average.average for the test period. The PSCW provides a return on selected CWIP and a cash working capital allowance by adjusting the percentage return on rate base.
(j)(h)WPL’s wholesale formula rates reflect annual changes in WACC and rate base.
(k)WPL’s wholesale average rate base reflects production-related rate base calculated as the simple average of the beginning of year and end of year balances in accordance with WPL’s approved formula rates.

ENVIRONMENTAL MATTERS

Overview - Alliant Energy, IPL and WPL are subject to regulation of environmental matters by federal, state and local authorities as a result of their current and past operations. Alliant Energy, IPL and WPL monitor these environmental matters and address them by installing controls that reduce emissions and by implementing operational modifications or other measures to address compliance obligations. These programs are subject to continuing review and are periodically revised due to various factors, including but not limited to changes in environmental regulations, litigation of environmental requirements, construction plans and compliance costs. There is currently significant regulatory uncertainty with respect to a number of environmental rules and regulations discussed below. Given the dynamic nature of environmental regulations and other related regulatory requirements, Alliant Energy, IPL and WPL have compliance plans to address these environmental obligations. Future expenditures for environmental compliance are expected to be material, including significant capital investments. Prudent expenditures incurred by IPL and WPL to comply with environmental requirements would likely be recovered in rates from their customers. Refer to “Strategic Overview - Environmental Compliance Plans” for details of environmental compliance plans, including discussion of specific projects and the associated estimated capital expenditures. The following are major environmental matters that could potentially have a significant impact on financial condition and results of operations.

Air Quality - The CAA and its amendments mandate preservation or enhancement of air quality through existing regulations and periodic reviews to ensure adequacy of the CAA provisions based on scientific data. As part of the basic framework under the CAA, the EPA is required to establish NAAQS, rules, which serve to protect public health and welfare. These rulesstandards address six “criteria” pollutants, four of which (NOx, SO2, PMparticulate matter and ozone) are particularly relevant to electric utility operations. Ozone is not directly emitted from EGUs; however, NOx emissions may contribute to its formation in the atmosphere. Fine particulate matter may also be formed in the atmosphere from SO2 and NOx emissions. Additional

SIPs document the collection of regulations that individual state agencies will apply to maintain NAAQS rules and related CAA requirements. The EPA must approve each SIP and if a SIP is not acceptable to the EPA or if a state chooses not to issue separate state rules, then the EPA can assume enforcement of the CAA in that state by issuing a federal implementation plan. Routinely monitored locations that do not comply with NAAQS rules may be classified by the EPA as non-attainment and require further actions to reduce emissions. Additional emissions standards may also be applied under the CAA regulatory framework beyond NAAQS rules.NAAQS. The specific federal and state air quality rules that may affect operations are listed in the table below. Refer to the sections below the following tablestable for detailed discussion of the followingthese air quality rules.

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Environmental Rule Emissions Regulated Alliant Energy’s Primary FacilitiesActual/Anticipated
Environmental RuleRegulatedPotentially Affected Actual/Anticipated Compliance Deadline
CSAPR SO2, NOx Fossil-fueled EGUs over 25 MW capacity in IA, WI and MN Phase I - 2015; Phase II - 2017
CAVRSO2, NOx, PMFossil-fueled EGUs built between 1962 and 1977 in IA and WITBD
MATS RuleMercury and other HAPsCoal-fired EGUs over 25 MW capacity in IA and WIApril 2015 (a)
Industrial Boiler and Process Heater MACT RuleMercury and other HAPsIPL’s Prairie Creek boilers 1, 2 and 5January 2016 (a)
Ozone NAAQS RuleNOxFossil-fueled EGUs in non-attainment areasDecember 2015
NO2 NAAQS RuleNO2Fossil-fueled EGUs in non-attainment areasTBD
SO2 NAAQS RuleSO2Fossil-fueled EGUs in non-attainment areasTBD
CAA Section 111(d) CO2 Existing fossil-fueled EGUs over 25 MW capacity Phase I - 2020-2029;2022-2029; Phase II - 2030
CAA Section 111(b) CO2 IPL’s Marshalltown facility and WPL’s proposed Riverside expansion Upon startup of EGU
(a)An additional year for compliance can be requested, which may be granted on a case-by-case basis by state permitting authorities or the EPA.

The following table lists the fossil-fueled generating facilitiesRefer to “Properties” in Item 2 for a list of IPL’s and WPL’s EGUs by primary fuel type that IPL and WPLthey currently own or operate, with greater than 25 MW of nameplate capacity. All of IPL’s generating facilities listed below are located in Iowa except for Fox Lake Unit 3, which is located in Minnesota. All of WPL’s generating facilities listed below are located in Wisconsin. Refer to “Strategic Overview” foras well as discussion of various generating facilities that may be retired or changed from coal-fired to an alternative fuel source in the next few years.future.
IPLWPL
CoalNatural GasOilCoalNatural Gas
Ottumwa 1Emery 1-3Marshalltown 1-3Columbia 1-2Riverside 1-3
Lansing 4Fox Lake 3Lime Creek 1-2Edgewater 3-5Sheboygan Falls 1-2
M.L. Kapp 2 (a)Sutherland 1,3Centerville 1-2Nelson Dewey 1-2Neenah 1-2
Burlington 1Dubuque 3-4South Fond du Lac 1-4
George Neal 3-4Rock River 3,5-6
Prairie Creek 3-4Sheepskin 1
Louisa 1

(a)M.L. Kapp Unit 2 is expected to switch from coal to natural gas as the only fuel type in 2015, contingent on approval from MISO.

As discussed in greater detail below, a number of these air regulations are subject to legal challenges, reconsideration and/or other uncertainties that affect the ability to predict with certainty what impact such regulations may have on financial condition and results of operations.

CSAPR - CSAPR is a regional SO2 and NOx cap-and-trade program, where compliance with emission limits may be achieved by purchasing emission allowances and/or reducing emissions through changes in operations or the additions of environmental controls. CSAPR establishes state-specific annual SO2 and NOx emission controls. In 2015, CSAPR replaced CAIR.caps and ozone season NOx emission caps. Compliance with CSAPR emissionsemission limits began in 2015, with additional emissionsemission limits reductions beginning in 2017. The emission allowances used for Acid RainAlliant Energy, IPL and CAIR program compliance cannot be used forWPL are currently in compliance with CSAPR.the Phase I CSAPR emission limits. CSAPR emission allowances may be banked for future year compliance. In September 2016, the EPA issued a final rule to further reduce the CSAPR ozone season NOx emission caps in 2017 for several states, including Iowa and Wisconsin. Alliant Energy, IPL and WPL will continue to monitor legal and regulatory developments related to CSAPR and currently expect to meet the finalexisting CSAPR compliance requirements based on planned and completed emissionenvironmental controls projects for various EGUs.

CAVR - CAVR requires states to develop and implement plans to address visibility impairment in designated national parks and wilderness areas across the U.S. with a national goal of no impairment by 2064. These implementation plans require BART emission controls at certain IPL and WPL fossil-fueled EGUs that were built between 1962 and 1977 and other additional measures needed for reducing state contributions to regional haze. IPL’s facilities that may be impacted include Burlington Unit 1, George Neal Units 3 and 4, Prairie Creek Unit 4, M.L. Kapp Unit 2 and Lansing Unit 4. WPL’s facilities that may be impacted include Edgewater Unit 4, Nelson Dewey Unit 2, and Columbia Units 1 and 2.


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In 2012, the EPA published a final rule (BART-CSAPR Rule) that allowed BART obligations for SO2 and NOx emissions to be fulfilled by compliance with CSAPR. In 2012, the EPA approved Wisconsin’s CAVR plan, which relied on the EPA’s BART-CSAPR rule. In 2012, the EPA issued a federal plan specifying that Iowa’s compliance with CSAPR would be sufficient to meet CAVR requirements. Groups have legally challenged the EPA’s reliance on CSAPR to satisfy CAVR BART requirements. Alliant Energy, IPL and WPL currently expect to comply with CSAPR requirements, thereby satisfying CAVR BART requirements.

MATS Rule - In 2011, the EPA issued the final MATS Rule for existing coal-fired EGUs, which requires emission limits for mercury and other HAPs and work practice standards. Compliance with the MATS Rule is required by April 2015; however, an entity can request an additional year for compliance for EGUs that are needed to assure power reliability, EGUs needed while building replacement generation or repowering to gas, or EGUs that need additional time to install air emission controls technology. In February 2014, the Wisconsin DNR approved an extension to the MATS Rule compliance deadline for WPL’s Edgewater Unit 3 and Nelson Dewey Units 1 and 2 to April 2016. In February 2015, IPL filed with the EPA for approval to extend the MATS Rule compliance deadline to April 2016 for M.L. Kapp Unit 2. In 2014 and 2013, IPL and WPL implemented emission controls projects at several of their newer, larger and more efficient EGUs. Construction of lower-cost emission controls projects at IPL’s Burlington Unit 1 and Prairie Creek Units 3 and 4, and WPL’s Edgewater Unit 4 were also completed in 2014. These projects support compliance obligations for current and anticipated air quality regulatory requirements, including the MATS Rule. As a result of these projects and the requests for extension of the compliance deadline for three EGUs, additional capital investments and modifications to IPL’s and WPL’s EGUs to comply with the MATS Rule are currently not expected to be significant. Given that this rule remains subject to legal challenges, and could possibly be revised or invalidated pending the outcome of court decisions, Alliant Energy, IPL and WPL are currently unable to predict with certainty the impact of the MATS Rule on their financial condition and results of operations.

In accordance with Wisconsin Statutes, EGUs complying with the MATS Rule by April 2015 would no longer be subject to the Wisconsin State Mercury Rule.

Industrial Boiler and Process Heater MACT Rule - In 2012, the EPA issued a final reconsidered Industrial Boiler and Process Heater MACT Rule with a compliance deadline of January 2016 for major sources; however, an entity can request an additional year for compliance, which may be granted on a case-by-case basis by state permitting authorities. In December 2014, the EPA issued notices of reconsideration for select elements of the rule. The rule is expected to apply to IPL’s Prairie Creek boilers 1, 2 and 5, and fossil-fueled auxiliary boilers and process heaters operated at other IPL and WPL fossil-fueled generating facilities. The rule requires compliance with HAPs emission limitations and work practice standards. Given that this rule remains subject to legal challenges in the D.C. Circuit Court, Alliant Energy and IPL are currently unable to predict with certainty the impact of the Industrial Boiler and Process Heater MACT rule on their financial condition and results of operations, but expect that capital investments and/or modifications to their generating facilities to meet compliance requirements of the rule could be significant. Future capital investments and modifications to WPL’s generating facilities to comply with this rule are currently not expected to be significant.

Ozone NAAQS Rule - The 2008 ozone NAAQS rule may require a reduction of NOx emissions in certain non-attainment areas based on classifications assigned by the EPA. There are five non-attainment classifications: marginal, moderate, serious, severe and extreme. In 2012, the EPA issued a final rule that classified Sheboygan County in Wisconsin as marginal ozone non-attainment, which requires this area to achieve the 2008 eight-hour ozone NAAQS by December 2015. WPL operates Edgewater and Sheboygan Falls in Sheboygan County, Wisconsin. The final rule does not list any non-attainment areas in Iowa or Minnesota that impact IPL. In 2013, the EPA issued a proposed rule to assist state agencies in developing SIPs. The SIPs will explain what actions and emission reductions may be required for compliance to achieve attainment. The Edgewater Unit 5 SCR system completed in 2012 is expected to assist with possible compliance obligations under the ozone NAAQS SIP for Wisconsin. In November 2014, the EPA proposed changes to make the current ozone NAAQS rule more stringent. The EPA is expected to issue a final revised ozone NAAQS rule in 2015. Given the Wisconsin DNR has not yet issued an eight-hour ozone non-attainment SIP, and the 2008 standard may be revised, Alliant Energy and WPL are currently unable to predict with certainty the impact of the ozone NAAQS rule on their financial condition and results of operations.

NO2 NAAQS Rule - In 2010, the EPA issued a final rule that establishes a new one-hour NAAQS for NO2. In 2012, the EPA issued a final rule that does not propose to designate any non-attainment areas in Iowa, Wisconsin or Minnesota. The EPA is expected to re-evaluate these designations in 2016 based on expanded monitoring data. Given that the EPA has not yet re-evaluated designations, Alliant Energy, IPL and WPL are currently unable to predict with certainty the impact of any potential NO2 NAAQS changes on their financial condition and results of operations.


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SO2 NAAQS Rule - In 2010, the EPA issued a final rule that establishes a new one-hour NAAQS for SO2. In 2013, the EPA finalized non-attainment designations for certain areas in the U.S. currently exceeding the SO2 standard based on ambient monitoring data, including part of Iowa and Wisconsin; however, IPL and WPL do not operate any EGUs in these areas. Non-attainment designations for the remainder of the U.S. have been delayed to allow for modeling and collection of additional monitoring data. A monitoring device has been installed near one of IPL’s EGUs, which could result in this area receiving a non-attainment designation. Alliant Energy and IPL are currently unable to predict with certainty the outcome of such monitoring activities. In May 2014, the EPA proposed a schedule for completing designations using modeled sources by December 2017 and using monitored sources by December 2020. Given that this rule remains subject to legal challenges and the EPA has not yet designated non-attainment areas for any areas where IPL or WPL operate EGUs, Alliant Energy, IPL and WPL are currently unable to predict with certainty the impact of the SO2 NAAQS rule on their financial condition and results of operations.

GHG Emissions - Climate change continues to be assessed by policymakers, including consideration of the appropriate actions to mitigate global warming.climate change. There is continued debate regarding the public policy response that the U.S. should adopt, involving both domestic actions and international efforts.

The primary GHG emitted from Alliant Energy’s, IPL’s and WPL’s utility operations is CO2 from the combustion of fossil fuels at their larger EGUs. In 2009, the EPA issued a finding that GHG emissions contribute to climate change, and therefore, threaten public health and welfare. This enabled the EPA to issue rules to report and regulate GHG emissions under the authority of the CAA. The EPA Mandatory GHG Reporting rule requires sources above certain threshold levels to monitor and report emissions. The primary GHG emitted from Alliant Energy’s, IPL’s and WPL’s utility operations is CO2 from the combustion of fossil fuels at their larger EGUs. Emissions of GHG are reported at the facility level in CO2e and include those facilities that emit 25,000 metric tons or more of CO2e annually. Annual emissions reported to the EPA for electric utility and natural gas distribution operations, in terms of total mass of CO2e, were as follows (in millions of metric tons):
 Alliant Energy IPL WPL
 2013 2012 2011 2013 2012 2011 2013 2012 2011
CO2e emissions (a)26.6 25.2 26.7 10.9 10.8 12.1 15.7 14.4 14.6

(a)CO2e emissions reported to the EPA represent all emissions from the facilities operated by IPL and WPL and do not reflect their share of co-owned facilities operated by other companies.

GHG Tailoring Rule - In 2010, the EPA issued the GHG Tailoring Rule, which establishes a GHG emissions threshold for major sources under the PSD construction permit and Title V operation permit. In June 2014, the Supreme Court ruled that the EPA may not treat GHG emissions as “air pollutants” for determining whether a major source is required to obtain a PSD or Title V permit, but held that the EPA can continue requiring Best Available Control Technology for GHG emissions from sources otherwise subject to review under the PSD program. This rule remains subject to legal challenges and further rulemaking may also be required to update state regulations implementing the GHG Tailoring Rule to make the Supreme Court’s decision effective.

Clean Air Act Section 111(d) - In June 2014,2015, the EPA issued proposedpublished final standards under Section 111(d) of the CAA, referred to as the Clean Power Plan, which establish guidelines for states to follow in developing plans to reduce CO2 emissions from existing fossil-fueled EGUs. The EPA’s proposal is based on broad measures that can reduce CO2 emissions from existing fossil-fueled EGUs, including making existing coal-fired EGUs more efficient, increasing dispatch of existing combined-cycle natural gas-fired EGUs, maintaining or expanding zero- or low-CO2 energy resources such as renewables and nuclear, and reducing customer demand for electricity through energy efficiency programs. The state-specific goals are based onfinal standards include an emissions rate basis measured in pounds per net MWh. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over theinterim compliance period from 20202022 through 2029 and a “final goal” based on a three-year rolling average that each state meetsfinal compliance requirement beginning in 2030.

State plans will determine In February 2016, the specific compliance requirements applicable to EGUs. Each state has flexibility in determining how to achieve the goals, which can include the broad measures included by the EPA as well as any other enforceable measures that the state can demonstrate will reduce CO2 emissions from existing fossil-fueled EGUs. The EPA also proposed to give states the option to convert the rate-based goal toSupreme Court issued a mass-based goal measured in tons. States can develop a state-only plan or collaborate in developing regional multi-state plans. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. If a state needs additional time and provides proper notification and explanation, the EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. In August 2014, the EPA’s legal authority to issue the proposed standards under Section 111(d)stay of the CAA was challenged. The EPA is currently expected to issueClean Power Plan until pending legal challenges are resolved, which places implementation of the final standards in 2015. Depending on the measures included in state plans for Iowa and Wisconsin, the expected dates for the retirement and fuel switching of certain of IPL’s and WPL’s coal-fired EGUs may be impacted by the new requirements. The implications of these new

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requirements and the resolution of legal challenges remain highly uncertain, and as a resulthold indefinitely. Alliant Energy, IPL and WPL are currently unable to predict with certainty the final outcome of these standards,the legal challenges to the Clean Power Plan or the impact of the final compliance requirements on their financial condition and results of operations, but expect that expenditures to comply with any regulations to reduce GHG emissionssuch requirements could be significant.

Clean Air Act Section 111(b) - In January 2014,2015, the EPA published revised proposed New Source Performance Standardsfinal standards under Section 111(b) of the CAA, for GHG emissions, which would establish CO2 emissions limits for certain new fossil-fueled EGUs. Marshalltown and WPL’s proposedthe Riverside expansion are expected to be impacted by, these proposed standards and would beare being constructed to achieve compliance with, these standards. TheGiven the EPA’s 111(b) rulemaking remains subject to legal challenges, Alliant Energy, IPL and WPL are currently unable to predict with certainty the impact of these standards.

In addition, in order for the EPA is currently expected to issue final standardsregulate existing fossil-fueled EGUs under Section 111(d) of the CAA, the EPA must have valid regulation of new fossil-fueled EGUs under Section 111(b) of the CAA. If the Section 111(b) legal challenges result in 2015.Section 111(b) being vacated, this could limit the EPA’s ability to implement the Clean Power Plan.

WPL Consent Decree - Refer to Note 16(e) for discussion of a Consent Decree approved by the U.S. District Court for the Western District of Wisconsin in 2013 and WPL’s obligations thereunder. The Consent Decree resolves a notice of violation issued by the EPA in 2009 and complaints filed by the Sierra Club in 2010 regarding alleged air permitting violations at Columbia, Edgewater and Nelson Dewey.

Other Air Quality MattersIPL Consent Decree - IPL,Refer to Note 16(e) for discussion of a Consent Decree approved by the EPA,U.S. District Court for the StateNorthern District of Iowa in 2015 and the Sierra Club are in discussions regardingIPL’s obligations thereunder. The Consent Decree resolves potential CAA issues associated with emissions from IPL’s Iowa operations. Alliant Energy and IPL believe that they arecoal-fired generating facilities in compliance with the CAA. IPL is pursuing these discussions because IPL believes there is an opportunity to reach an agreement among the parties that avoids potential litigation and the long-term planning and operational uncertainty associated with such litigation. Alliant Energy and IPL believe that any agreement could contain terms similar to those seen in other EPA CAA settlements, including, among others, the installation of emission controls, the retirement or fuel switching of EGUs, compliance with specified emission rates and emission caps, beneficial environmental mitigation projects and penalties, such as those addressed by the WPL Consent Decree. Alliant Energy and IPL are currently unable to predict with certainty the outcome of these discussions and the impact on their financial condition or results of operations.Iowa.


Water Quality -
Section 316(b) of Federal Clean Water ActEffluent Limitation Guidelines - In August 2014,2015, the EPA published a final rule related to Section 316(b) of the Federal Clean Water Act to regulate cooling water intake structures and minimize adverse environmental impacts to fish and other aquatic life. This rule applies to existing and new cooling water intake structures at certain steam generating and manufacturing facilities. IPL and WPL have identified nine (Ottumwa 1, Prairie Creek Units 3-4, Fox Lake Units 1 and 3, Lansing Unit 4, Dubuque Units 3-4, M.L. Kapp Unit 2, Burlington Unit 1, George Neal Units 3-4 and Louisa Unit 1) and three (Columbia Units 1-2, Nelson Dewey Units 1-2 and Edgewater Units 3-5) generating facilities, respectively, which may be impacted by the final Section 316(b) Rule. Compliance with this final rule will be incorporated during periodic facility permit renewal cycles, with final compliance anticipated by 2022. Alliant Energy, IPL and WPL have completed a preliminary assessment of the final Section 316(b) rule and expect to begin generating facility studies in 2015. Alliant Energy, IPL and WPL do not currently believe there will be a significant impact from the EPA’s Section 316(b) rule on their financial condition and results of operations.

Effluent Limitation Guidelines - In 2013, the EPA issued proposed effluent limitation guidelines, which wouldare expected to require changes to discharge limits for wastewater from certain IPL and WPL steam generating facilities. IPL and WPL have identified eleven (Emery Units 1-3, Ottumwa Unit 1, Prairie Creek Units 3-4, Fox Lake Units 1 and 3, Lansing Unit 4, Dubuque Units 3-4, M.L. Kapp Unit 2, Burlington Unit 1, Sutherland Units 1 and 3, George Neal Units 3-4 and Louisa Unit 1) and four (Riverside Units 1-3, Columbia Units 1-2, Nelson Dewey Units 1-2 and Edgewater Units 3-5) existing steam generating facilities, respectively, that are expected to be impacted by these guidelines. In addition, Marshalltown and WPL’s proposed Riverside expansion are expected to be impacted by these guidelines. Compliance with these proposedthe final guidelines wouldfor existing steam generating facilities will be required after JulyNovember 1, 20172018 but before July 1, 2022,December 31, 2023, depending on each facility’s wastewater permit cycle for existing steam generating facilities and immediately upon operationrenewal cycle. Effective January 2016, compliance for new steam generating facilities constructed after the issuance of the final guidelines. Given that the EPA has not yet issued final is required immediately upon operation. Projects required for compliance with these guidelines will be facility specific. Alliant Energy, IPL and WPL are currently unable to predict with certainty the impact of these guidelines on their financial condition and results of operations, but believe the expenditures to comply with these guidelines could be significant.

Hydroelectric Fish Passage Device - In 2002, FERC issued an order requiring WPL to install a fish passage device at its Prairie du Sac hydro plant. WPL has been working with the FWS and the Wisconsin DNR on the final design for the fish passage device. In 2013, the FWS initiated an environmental study of the fish passage device under the National Environmental Policy Act, which could result in changes to the design of the fish passage device. The FWS has indicated that this environmental study will be completed in 2015. In September 2014, FERC issued an order approving an extension of the project deadline to December 31, 2020. Alliant Energy and WPL currently believe the required capital investments and/or modifications to install the currently designed fish passage device at the facility could be approximately $15 million.


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Land and Solid Waste -
Coal Combustion Residuals Rule - In December 2014, the EPA issuedRefer to Note 13 for discussion of the final CCR rule, which regulates CCR as a non-hazardous waste. The final rule establishes minimum criteria for disposing of CCR in landfills and surface impoundments (ash ponds), and allows for continued operation of ash ponds if they meet certain location and performance criteria. Compliance with the final rule is specific for each ash pond and landfill. Individual ash ponds or landfills not meeting performance criteria must initiate corrective action or be subject to closure. The final rule includes an incentive of no further regulation for inactive ash pondsRule, including additional AROs that can be closed within 36 months of the effective date of the CCR rule. IPL and WPL have nine and three existing coal ash ponds related to current and former coal-fired EGUs, respectively. In addition, IPL and WPL have four and two active CCR landfills, respectively. All of these CCR disposal units are subject to the final rule, which is currently anticipated to become effective in 2015. The schedule for compliance with this rule has not yet been established.were recognized by Alliant Energy, IPL and WPL are currently evaluating the final rule to determine the full impact of the final CCR rule, including any additional AROs that may need to be recognized in 2015 as a result of thisrelated to such rule.

MGP Sites - Refer to Note 16(e) for discussion of IPL’s and WPL’s MGP sites.

Other - Refer to Note 16(e), Item 1 Business, “Strategic Overview” and “Liquidity and Capital Resources” for further discussion of environmental matters, including discussion of specific projects and the associated estimated capital expenditures.

LEGISLATIVE MATTERS

Overview - Various legislative developments are monitored, including those relating to energy, tax, financial and other matters. Key legislative developments include the following:

FTIPProtecting Americans from Tax Hikes Act - In December 2014,2015, the FTIPPATH Act was enacted. The most significant provisions of the FTIPPATH Act for Alliant Energy, IPL and WPL relate to the extension of bonus depreciation deductions for certain capital expenditures for property that were incurred through December 31, 2014. As a result, Alliant Energy currently estimates its total bonus depreciation deductions to be claimed on its U.S. federal income tax return for calendar year 2014 will be approximately $450 million ($245 million for IPL and $190 million for WPL). For calendar year 2015, Alliant Energy will be allowed bonus depreciation deductions for certain expenditures incurred through December 31, 20142019 and placed in service before January 1, 2016. Alliant Energy currently estimates its totalprior to December 31, 2020, as well as incentives for individuals and businesses to construct renewable generation. These estimated bonus depreciation deductions are expected to be claimed on its U.S. federal incomecreate additional deferred tax return for calendar year 2015 for these expenditures will be approximately $50 million ($40 millionliabilities for IPL and $10 million for WPL).

ALLIANT ENERGY’S RESULTS OF OPERATIONS

Overview - “Executive Summary” provides an overview of Alliant Energy’s 2014 and 2013 earnings and the various components of its business. Additional details of Alliant Energy’s 2014, 2013 and 2012 earnings are discussed below.

Utility Electric Margins - Electric margins are defined as electric operating revenues less electric production fuel, energy purchases and purchased electric capacity expenses. Management believes that electric margins provide a more meaningful basis for evaluating utility operations than electric operating revenues since electric production fuel, energy purchases and purchased electric capacity expenses are generally passed through to customers, and therefore, result in changes to electric operating revenues that are comparable to changes in electric production fuel, energy purchases and purchased electric capacity expenses. Electric margins and MWh sales for Alliant Energy were as follows:

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 Revenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$994.5
 
$1,009.1
 (1%) 
$975.9
 3% 7,697
 7,824
 (2%) 7,679
 2%
Commercial658.0
 649.4
 1% 611.4
 6% 6,449
 6,432
 —% 6,352
 1%
Industrial799.0
 765.4
 4% 741.8
 3% 11,821
 11,471
 3% 11,555
 (1%)
Retail subtotal2,451.5
 2,423.9
 1% 2,329.1
 4% 25,967
 25,727
 1% 25,586
 1%
Sales for resale:                   
Wholesale206.6
 195.4
 6% 187.6
 4% 3,586
 3,564
 1% 3,317
 7%
Bulk power and other2.9
 17.7
 (84%) 23.8
 (26%) 335
 763
 (56%) 1,303
 (41%)
Other52.6
 52.0
 1% 48.8
 7% 155
 152
 2% 151
 1%
Total revenues/sales2,713.6
 2,689.0
 1% 2,589.3
 4% 30,043
 30,206
 (1%) 30,357
 —%
Electric production fuel expense443.9
 431.0
 3% 367.2
 17%          
Energy purchases expense408.2
 294.0
 39% 345.1
 (15%)          
Purchased electric capacity expense25.1
 216.8
 (88%) 271.5
 (20%)          
Margins (c)
$1,836.4
 
$1,747.2
 5% 
$1,605.5
 9%          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.
(c)
Includes $85 million, $79 million and $83 million of credits on IPL’s Iowa retail electric customers’ bills for 2014, 2013 and 2012, respectively, resulting from the electric tax benefit rider. The electric tax benefit rider resulted in reductions in electric revenues that were offset by reductions in income tax expense for 2014, 2013 and 2012.

Variances between periods in electric margins were as follows (in millions):
2014 vs. 2013 Summary:Alliant Energy IPL WPL
Lower purchased electric capacity expense at IPL related to the previous DAEC PPA, which ended in February 2014
$129
 
$129
 
$—
Purchased electric capacity expense at WPL during 2013 related to the Kewaunee PPA, which ended in December 201361
 
 61
Higher revenues at IPL related to changes in recovery amounts for transmission costs through the transmission rider (a)18
 18
 
Retail electric customer billing credits at IPL (b)(72) (72) 
Estimated decrease from changes in sales caused by weather conditions(17) (13) (4)
Lower wholesale margins (c)(11) (4) (7)
Changes in electric fuel-related costs, net of recoveries at WPL(9) 
 (9)
Changes in revenue requirement adjustment related to certain tax benefits from tax accounting method changes at IPL (d)(9) (9) 
Lower revenues at IPL due to changes in credits on Iowa retail electric customers’ bills resulting from the electric tax benefit rider (d)(6) (6) 
Other (e)5
 (1) 7
 
$89
 
$42
 
$48
2013 vs. 2012 Summary:Alliant Energy IPL WPL
Higher revenues at IPL related to changes in recovery amounts for transmission costs through the transmission rider (a)
$60
 
$60
 
$—
Purchased electric capacity expense at WPL during 2012 related to the Riverside PPA, which terminated in December 201259
 
 59
Changes in revenue requirement adjustment related to certain tax benefits from tax accounting method changes at IPL (d)24
 24
 
Estimated increase (decrease) from changes in sales caused by weather conditions(11) 1
 (12)
Other (e)10
 (3) 13
 
$142
 
$82
 
$60


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(a)Higher transmission rider revenues were offset by higher electric transmission service expense.
(b)
Billing credits began in May 2014 related to the approved settlement agreement for IPL’s Iowa retail electric rates. Refer to “Rate Matters - IPL’s Iowa Retail Electric Rate Settlement Agreement” for further discussion.
(c)Primarily due to lower nuclear capacity costs in 2014 which are included in the rates charged to wholesale customers.
(d)
Refer to Note 2 for further discussion of IPL’s revenue requirement adjustment and electric tax benefit rider.
(e)Includes increases in weather-normalized retail sales volumes at WPL in 2014 and 2013. Refer to “Sales Trends” below for more information.

Forecast - Refer to “Rate Matters” for discussion of anticipated reductions of IPL’s retail electric customer billing credits in 2015 related to the approved settlement agreement for IPL’s Iowa retail electric rates and the electric tax benefit rider. Refer to Note 2 for WPL’s retail electric base rate case order received by WPL in July 2014 for the 2015/2016 test period and the order received by WPL in December 2014 for the retail fuel-related rate case for 2015.

Weather Conditions - Electric sales demand is seasonal to some extent with the annual peak normally occurring in the summer months due to air conditioning usage by its residential, commercial and wholesale customers. HDD data is used to measure the variability of temperatures during winter months and is correlated with both electric and gas sales demand. CDD data is used to measure the variability of temperatures during summer months and is correlated with electric sales demand. HDD and CDD in Alliant Energy’s service territories were as follows:
 Actual  
HDD (a):2014 2013 2012 Normal (a)
Cedar Rapids, Iowa (IPL)7,657
 7,232
 5,901
 6,763
Madison, Wisconsin (WPL)7,884
 7,627
 5,964
 7,031
CDD (a):       
Cedar Rapids, Iowa (IPL)670
 884
 1,052
 755
Madison, Wisconsin (WPL)620
 709
 1,070
 658

(a)HDD and CDD are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical HDD and CDD.

Estimated increases to electric margins from the impacts of weather were as follows (in millions):
 2014 2013 2012
IPL
$3
 
$16
 
$15
WPL5
 9
 21
Total Alliant Energy
$8
 
$25
 
$36

Electric Production Fuel and Energy Purchases (Fuel-related) Cost Recoveries - Fossil fuels, such as coal and natural gas, are burned to produce electricity at EGUs. The cost of fossil fuels used during each period is included in electric production fuel expense. Electricity is also purchased to meet customer demand and these costs are charged to energy purchases expense. The impact on electric margins of changes in electricity volumes generated from EGUs, changes in energy volumes purchased and changes in bulk power sales volumes generally offset.

Due to IPL’s cost recovery mechanisms for fuel-related costs, changes in fuel-related costs resulted in comparable changes in electric revenues, and therefore, did not have a significant impact on electric margins. WPL’s cost recovery mechanism for wholesale fuel-related costs also provides for adjustments to its wholesale electric rates for changes in commodity costs, thereby mitigating impacts of changes to commodity costs on electric margins.

WPL’s cost recovery mechanism for retail fuel-related costs provides deferral for amounts that fall outside an approved bandwidth of plus or minus 2%. The difference between revenue collected and actual fuel-related costs incurred within the bandwidth increase or (decrease) electric margins. WPL estimates the increase (decrease) to electric margins from amounts within the bandwidth were approximately ($5) million, $4 million and $6 million in 2014, 2013, and 2012, respectively. Refer to Note 2 for discussion of fuel-related costs incurred by WPL that were outside the approved annual bandwidth for 2014 and 2012.

Refer to “Other Matters - Market Risk Sensitive Instruments and Positions” for further discussion of risks associated with increased fuel-related expenses on WPL’s electric margins. Refer to “Rate Matters” and Note 1(g) for additional information relating to recovery mechanisms for fuel-related expenses.

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2014 vs. 2013 Summary - Electric production fuel expense increased $13 million in 2014 primarily due to the unseasonably cold weather conditions in Alliant Energy’s service territory in the first quarter of 2014, which resulted in higher commodity prices and increased customer demand in the first quarter of 2014. This contributed to higher MISO dispatch of IPL’s and WPL’s EGUs in the first quarter of 2014. The increase in 2014 was also due to changes in the under-/over-collection of fuel-related costs at IPL. These items were partially offset by deferred fuel-related costs incurred that fell outside the approved bandwidth for 2014 at WPL, as well as lower dispatch at WPL’s coal-fired EGUs during the third quarter of 2014, which included impacts of lower than planned coal deliveries.

Energy purchases expense increased $114 million in 2014 primarily due to increased prices for electricity, partially resulting from IPL’s new DAEC PPA and the expiration of WPL’s Kewaunee PPA, and increased volumes partially due to lower dispatch of WPL’s coal-fired EGUs during the third quarter of 2014. The increase was also due to extremely cold temperatures in the first quarter of 2014 contributing to higher prices for electricity purchased by IPL and WPL from wholesale energy markets (primarily MISO) for 2014.

2013 vs. 2012 Summary - Electric production fuel expense increased $64 million and energy purchases expense decreased $51 million in 2013. Higher MISO dispatch of WPL’s generating facilities during 2013 compared to 2012 resulted in an increase in electric production fuel expense and a decrease in energy purchases expense for Alliant Energy and WPL. These changes were partially due to the Riverside PPA being terminated in conjunction with WPL’s acquisition of Riverside in December 2012. Partially offsetting the decrease in energy purchases expense for Alliant Energy was an increase in energy purchases expense at IPL primarily due to higher prices for electricity purchased from wholesale energy markets (primarily MISO) in 2013.

Purchased Electric Capacity Expense - PPAs help meet customer demand. Certain of these PPAs included minimum payments for IPL’s and WPL’s rights to electric generating capacity. The previous DAEC PPA expired in February 2014, the Kewaunee PPA expired in December 2013 and the Riverside PPA terminated in conjunction with WPL’s acquisition of Riverside in 2012. Details of purchased electric capacity expense included in the utility electric margins table above were as follows (in millions):
 2014 2013 2012
DAEC PPA (IPL)
$25
 
$154
 
$152
Kewaunee PPA (WPL)
 61
 59
Riverside PPA (WPL)
 
 59
Other
 2
 2
 
$25
 
$217
 
$272

Forecast - Purchased electric capacity expense at Alliant Energy and IPL is expected to decrease in 2015 compared to 2014 due to the expiration of the previous DAEC PPA in February 2014 and the new DAEC PPA effective February 2014 not containing minimum payments for electric generating capacity.

Sales Trends - Retail sales volumes increased 1% in 2014 and 1% in 2013. The 2014 increase was primarily due to an increase in industrial sales at IPL and WPL due to production expansion at several customers and higher IPL co-generation customer requirements, and modest customer growth in WPL’s service territory in 2014. These increases were partially offset by the impact weather conditions had on electric sales in 2014. The unseasonably cold weather conditionsAny decreases in IPL’s and WPL’s service territoriesrate base amounts in the first quarter of 2014 increased sales andrate setting process caused by the cooler than normal summer temperatures during the third quarter of 2014 decreased sales. In comparison, temperatures during the third quarter of 2013 were warmer than normal resultingexpected increase in increased sales. These changes in weather conditions caused an overall decrease in residential and commercial sales in 2014 compareddeferred tax liabilities are expected to 2013. The 2013 increase was due to increases in weather-normalized retail sales volumes primarily at WPL related to economic recovery and modest customer growth experienced in WPL’s service territory. These increases werebe partially offset by the unseasonably warm weather conditions during the third quarter of 2012 and a decrease in industrial sales volumes at IPL in 2013 due to lower co-generation customer requirements.

Wholesale sales volumes increased 1% in 2014 and 7% in 2013. The 2014 increase was primarily due to increases in sales to one of IPL’s full-requirement wholesale customers due to production expansion partially offset by the impact of changes in sales toand WPL’s partial-requirement wholesale customers that have contractual options to be served by WPL, other power supply sources or the MISO market. The 2013 increase was primarilyrate base amounts due to the impact ofadditional deferred tax assets expected from additional net operating losses. These bonus depreciation estimates could change based on various factors, including regulatory approvals, changes in sales to WPL’s partial-requirement wholesale customers.


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Bulk power and other revenue changes were largely due to changes in salescapital expenditures incurred, additional clarifications in the wholesale energy markets operated by MISO and PJM. These changes are impacted by several factors includingPATH Act, or the availability and dispatchtiming of Alliant Energy’s EGUs and electricity demand within these wholesale energy markets. Changes in bulk power and other sales revenues were largely offset by changes in fuel-related costs, and therefore, did not have a significant impact on electric margins.

Refer to “Rate Matters” for discussion of the IUB’s approval of IPL’s retail electric rate settlement agreement in September 2014, which includes a retail electric base rate freeze at IPL through the end of 2016. Refer to Note 2 for discussion of WPL’s retail fuel-related rate increases effective January 1, 2014 and 2015, WPL retail rate cases including a retail electric base rate freeze at WPL through the end of 2016, IPL’s electric tax benefit rider, and IPL’s revenue requirement adjustment, which became effective in January 2013. Refer to “Other Future Considerations” for discussion of recent notifications provided to each of IPL and WPL to terminate certain of their wholesale power supply agreements.

Forecast - Alliant Energy, IPL and WPL are currently expecting a modest increase in weather-normalized retail electric sales in 2015 compared to 2014.

Utility Gas Margins - Gas margins are defined as gas operating revenues less cost of gas sold. Management believes that gas margins provide a more meaningful basis for evaluating utility operations than gas operating revenues since cost of gas soldwhen property is generally passed through to customers, and therefore, results in changes to gas operating revenues that are comparable to changes in cost of gas sold. Gas margins and Dth sales for Alliant Energy were as follows:
 Revenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$287.5
 
$262.5
 10% 
$224.3
 17% 31,718
 29,916
 6% 23,071
 30%
Commercial172.8
 150.3
 15% 124.3
 21% 23,301
 21,892
 6% 17,115
 28%
Industrial23.4
 21.1
 11% 16.7
 26% 3,710
 3,803
 (2%) 3,068
 24%
Retail subtotal483.7
 433.9
 11% 365.3
 19% 58,729
 55,611
 6% 43,254
 29%
Transportation/other33.8
 30.9
 9% 31.0
 —% 64,717
 60,261
 7% 57,532
 5%
Total revenues/sales517.5
 464.8
 11% 396.3
 17% 123,446
 115,872
 7% 100,786
 15%
Cost of gas sold327.8
 276.7
 18% 217.2
 27%          
Margins (c)
$189.7
 
$188.1
 1% 
$179.1
 5%          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.
(c)
Includes $12 million and $11 million of credits on IPL’s Iowa retail gas customers’ bills for 2014 and 2013, respectively, resulting from the gas tax benefit rider. The gas tax benefit rider resulted in reductions in gas revenues that were offset by reductions in income tax expense for 2014 and 2013.

Variances between periods in gas margins were as follows (in millions):
2014 vs. 2013 Summary:Alliant Energy IPL WPL
Estimated increase from changes in sales caused by weather conditions
$4
 
$2
 
$2
Lower revenues at IPL related to changes in recovery amounts for energy efficiency costs through the energy efficiency rider (a)(4) (4) 
Other2
 (1) 2
 
$2
 
($3) 
$4
2013 vs. 2012 Summary:Alliant Energy IPL WPL
Estimated increase from changes in sales caused by weather conditions
$19
 
$9
 
$10
Higher revenues at IPL related to changes in recovery amounts for energy efficiency costs through the energy efficiency rider (a)5
 5
 
Lower revenues at IPL due to credits on Iowa retail gas customers’ bills resulting from the gas tax benefit rider in 2013(11) (11) 
Higher (lower) revenues due to the impact of changes in retail gas base rates effective January 2013(9) 6
 (15)
Other5
 3
 2
 
$9
 
$12
 
($3)

(a)Changes in energy efficiency revenues were mostly offset by changes in energy efficiency expense included in other operation and maintenance expenses.

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Natural Gas Cost Recoveries - Cost of gas sold increased $51 million in 2014 and $60 million in 2013. These increases were primarily due to higher retail gas volumes caused by weather discussed below. Refer to Note 1(g) for additional information relating to natural gas cost recoveries.

Weather Conditions - Gas sales demand follows a seasonal pattern with an annual base load of gas and a large heating peak occurring during the winter season. HDD data is used to measure the variability of temperatures during winter months and is correlated with gas sales demand. Refer to “Utility Electric Margins” for HDD data details.

Estimated increases (decreases) to gas margins from the impacts of weather were as follows (in millions):
 2014 2013 2012
IPL
$5
 
$3
 
($6)
WPL5
 3
 (7)
Total Alliant Energy
$10
 
$6
 
($13)

Refer to “Rate Matters” for discussion of IPL’s gas tax benefit rider and retail rate cases, including an interim retail gas base rate increase effective June 2012 and final retail gas base rate increase effective January 2013 for IPL’s Iowa customers and retail gas base rate decreases for WPL’s customers effective January 2013 and 2015.

Utility Other Revenues - Variances between periods in utility other revenues were as follows (in millions):
2014 vs. 2013 Summary:Alliant Energy IPL WPL
Lower coal sales at WPL (a)
($7) 
$—
 
($7)
Higher margins from IPL’s sharing mechanism related to optimizing gas capacity contracts (b)4
 4
 
Other(2) 1
 (3)
 
($5) 
$5
 
($10)
2013 vs. 2012 Summary:Alliant Energy IPL WPL
Higher coal sales at WPL (a)
$7
 
$—
 
$7
Capacity revenues recognized by WPL in 2013 (c)6
 
 6
Other2
 1
 1
 
$15
 
$1
 
$14

(a)Changes in utility other revenues related to coal sales were largely offset by changes in utility other operation and maintenance expenses related to coal sales.
(b)Approximately 50% of all margins earned from IPL’s sharing mechanism relating to optimizing gas capacity contracts flow through the purchased gas adjustment clause to reduce retail gas customer bills in Iowa. The remaining margins are retained by IPL and recorded in utility other revenues. Due to the extreme cold temperatures causing natural gas price fluctuations in the first quarter of 2014, margins were higher than normal in 2014.
(c)WPL recognized capacity revenues in 2014 and 2013 related to a PPA with a third party for the sale of a portion of Riverside’s capacity assumed by WPL with the acquisition of Riverside in December 2012. The PPA expired in May 2014. These capacity revenues were mostly offset by contract amortization expense included in utility other operation and maintenance expenses.

Electric Transmission Service Expense - Variances between periods in electric transmission service expense were as follows (in millions):
 2014 vs. 2013 2013 vs. 2012
 Alliant Energy IPL WPL Alliant Energy IPL WPL
Higher electric transmission service costs billed from ITC, ATC and MISO (a)
$38
 
$33
 
$5
 
$52
 
$41
 
$11
Changes in the under-/over-collection of electric transmission service expense through the transmission cost rider at IPL (b)(11) (11) 
 22
 22
 
Other2
 
 2
 3
 3
 
 
$29
 
$22
 
$7
 
$77
 
$66
 
$11


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(a)Primarily due to increased electric transmission service rates.
(b)IPL is currently recovering the Iowa retail portion of its increased electric transmission service costs from its retail electric customers in Iowa through a transmission cost rider approved by the IUB in January 2011 and extended as part of the rate settlement approved in September 2014. The difference between electric transmission services expense and amounts collected from customers as electric revenues results in temporary costs (credits) recorded in electric transmission service expense until the amounts are reflected in future customer billings.

Refer to Notes 1(g) and 2 for additional information relating to recovery of electric transmission service expenses.

Forecast - Refer to “Other Future Considerations” for discussion of a potential increase in future electric transmission service expense in 2015 compared to 2014.

Utility Other Operation and Maintenance Expenses- Variances between periods in utility other operation and maintenance expenses were as follows (in millions):
2014 vs. 2013 Summary:Alliant Energy IPL WPL
Higher energy efficiency cost recovery amortizations at WPL (a)
$20
 
$—
 
$20
Regulatory-related credit at IPL from a MPUC decision regarding Whispering Willow - East recorded in 2013 (b)7
 7
 
Higher generation expense (c)7
 4
 3
Higher customer service expense (d)6
 4
 2
Lower employee benefits-related expense (e)(8) (5) (3)
Lower expense related to coal sales at WPL (f)(7) 
 (7)
Other (g)13
 9
 4
 
$38
 
$19
 
$19
2013 vs. 2012 Summary:Alliant Energy IPL WPL
Higher generation expense (c)
$16
 
$3
 
$13
Higher performance-based compensation expense (h)11
 6
 5
Higher distribution system expense (i)10
 6
 4
Higher expense related to coal sales at WPL (f)7
 
 7
Higher bad debt expense at IPL (j)6
 6
 
Regulatory-related credits from WPL’s 2013/2014 rate case decision recorded in 2012 (k)5
 
 5
Higher cost of capital charges from Corporate Services (l)5
 3
 2
Contract amortization expense at WPL in 2013 (m)5
 
 5
Lower energy efficiency cost recovery amortizations at WPL (a)(20) 
 (20)
Regulatory-related credit at IPL from a MPUC decision regarding Whispering Willow - East recorded in 2013 (b)(7) (7) 
Other(7) (5) (3)
 
$31
 
$12
 
$18

(a)The July 2012 PSCW order for WPL’s 2013/2014 test period electric and gas base rate case authorized changes in energy efficiency cost recovery amortizations for 2013 and 2014. Regulatory amortizations at WPL related to energy efficiency costs were $42 million, $22 million and $42 million in 2014, 2013 and 2012, respectively.
(b)
Refer to Note 3 for details of a regulatory-related credit recorded by IPL in 2013 due to decisions by the MPUC regarding recovery of costs for IPL’s Whispering Willow - East wind project.
(c)Primarily due to the timing and extent of maintenance projects at IPL’s and WPL’s EGUs. The increase in 2013 was also due to additional operation and maintenance expenses related to Riverside, which was acquired in December 2012.
(d)Primarily due to increased customer billing and customer assistance-related expenses.
(e)
Primarily due to a decrease in retirement plan costs, partially offset by an increase in other employee benefits-related costs and the reversal of a previously recorded reserve related to the Cash Balance Plan in 2013. Refer to Note 12(a) for details of the Cash Balance Plan reserve.
(f)Changes in expense related to coal sales at WPL were largely offset by changes in coal sales revenue at WPL.
(g)Primarily due to increases in other administrative and general and distribution system expenses.
(h)Performance-based compensation expense is largely based on the achievement of specific operational and financial performance measures compared to targets established within the performance-based compensation plans.

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(i)Primarily due to increased maintenance of the electric and gas distribution systems at IPL and WPL.
(j)Higher bad debt expense at IPL in 2013 was largely due to increases in past due accounts receivable during 2013.
(k)
Refer to Notes 2 and 3 for details of regulatory-related charges and credits recognized in 2012.
(l)Corporate Services bills IPL and WPL cost of capital charges in accordance with a service agreement. The 2013 increase was primarily due to increased property additions at Corporate Services in 2013.
(m)Resulting from the amortization of capacity rights related to a PPA with a third party for the sale of a portion of Riverside’s capacity WPL assumed with the acquisition of Riverside. The PPA expired in May 2014. These amortization expenses were largely offset by capacity revenues included in utility other revenues.

Forecast - Alliant Energy currently expects its other operation and maintenance expenses to decrease in 2015 compared to 2014 primarily due to decreases in energy efficiency cost recovery amortizations approved by the PSCW in a July 2014 order, partially offset by expected increases in retirement plan costs in 2015 compared to 2014, resulting from decreases in discount rates and a change to the life expectancy assumption.

Depreciation and Amortization Expenses -
2014 vs. 2013 Summary - Depreciation and amortization expenses increased $17 million in 2014 primarily due to increased property additions, including various emission controls projects at IPL and WPL placed in service in the second half of 2013 and in 2014.

2013 vs. 2012 Summary - Depreciation and amortization expenses increased $39 million in 2013 primarily due to depreciation expense at WPL related to Riverside, WPL’s SCR project at Edgewater Unit 5, which was placed in service in the fourth quarter of 2012, new depreciation rates implemented by WPL effective January 2013, and depreciation expense at the Franklin County wind project, which was placed in service in the fourth quarter of 2012.

Forecast - Alliant Energy currently expects its depreciation and amortization expenses to increase in 2015 compared to 2014 due to property additions, including various emission controls projects at IPL and WPL placed in service in 2014 and expected to be placed in service in 2015.

Interest Expense-
2014 vs. 2013 Summary - Interest expense increased $8 million in 2014 primarily due to $9 million of higher interest expense recorded in 2014 compared to 2013 for IPL’s $250 million 4.7% senior debentures issued in October 2013.

2013 vs. 2012 Summary - Interest expense increased $16 million in 2013 primarily due to $6 million of capitalized interest recognized in 2012 for the Franklin County wind project, $5 million of higher interest expense recorded in 2013 compared to 2012 for WPL’s 2.25% debentures issued in November 2012 to fund a portion of the purchase price of Riverside and $3 million of interest expense recorded in 2013 for IPL’s 4.7% senior debentures issued in October 2013.

service. Refer toNote 9 for additional details of debt.

Forecast - Alliant Energy currently expects its interest expense to increase in 2015 compared to 2014 due to financings in 2014 and 2015. Refer to Note 9 for additional details of financings in 2014 andLiquidity and Capital Resources” for detailsdiscussion of Alliant Energy’s financings anticipated in 2015.the impact of these estimated bonus depreciation deductions on net operating loss carryforwards and the expected amount and timing of future federal income tax payments.

AFUDC -
2014 vs. 2013 Summary - AFUDC increased $4 million in 2014 primarily due to increased CWIP balances related to IPL’s Marshalltown and changes in AFUDC recognized for IPL’s and WPL’s emission controls projects.

2013 vs. 2012 Summary - AFUDC increased $9 million in 2013 primarily due to changes in AFUDC recognized for IPL’s and WPL’s emission controls projects.

Refer to Note 3 for additional details of AFUDC recognized in 2014, 2013 and 2012.

Forecast - Alliant Energy currently expects AFUDC to increase in 2015 compared to 2014 primarily due to increased CWIP balances related to Marshalltown.

Income Taxes - Refer to Note 11 for details of effective income tax rates for continuing operations, including discussion of tax benefit riders, production tax credits, the effect of rate-making on property-related differences and a state apportionment change in 2012 related to the sale of RMT.

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Forecast - Alliant Energy currently expects to record lower tax benefits from the effect of rate-making on property-related differences in 2015 compared to 2014 and lower tax benefits from the impacts of the electric tax benefit rider due to lower billing credits on Iowa retail electric customers’ bills expected in 2015 compared to 2014.

Loss from Discontinued Operations, Net of Tax - Refer to Note 19 for discussion of discontinued operations.

Preferred Dividend Requirements of Subsidiaries - Preferred dividend requirements of subsidiaries decreased $8 million in 2014 and increased $2 million in 2013 primarily due to IPL and WPL recording charges of $5 million and $1 million in 2013, respectively, related to the redemption of preferred stock. Refer to Note 8 for additional discussion of IPL’s and WPL’s preferred stock transactions.

IPL’S RESULTS OF OPERATIONS

Overview - Earnings available for common stock increased $11 million in 2014 and $36 million in 2013. The 2014 increase was the result of lower purchased electric capacity expense related to the previous DAEC PPA and higher income tax benefits. These items were partially offset by electric customer billing credits related to a rate case settlement approved in 2014, lower retail electric sales due to changes in weather conditions in IPL’s service territory and higher interest, depreciation and other operation and maintenance expenses. The 2013 increase was primarily due to higher electric revenues from the revenue requirement adjustment related to certain tax benefits from tax accounting method changes, which became effective in January 2013, higher AFUDC in 2013 for IPL’s emission controls projects, higher income tax benefits and higher gas revenues from increased sales and a rate increase implemented in January 2013. These items were partially offset by higher other operation and maintenance expenses.

Electric Margins - Electric margins and MWh sales for IPL were as follows:
 Revenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$556.4
 
$574.3
 (3%) 
$529.9
 8% 4,164
 4,272
 (3%) 4,141
 3%
Commercial410.2
 409.6
 —% 365.3
 12% 4,099
 4,118
 —% 4,045
 2%
Industrial458.5
 442.9
 4% 408.0
 9% 7,132
 6,973
 2% 7,116
 (2%)
Retail subtotal1,425.1
 1,426.8
 —% 1,303.2
 9% 15,395
 15,363
 —% 15,302
 —%
Sales for resale:                   
Wholesale32.2
 30.0
 7% 27.8
 8% 485
 419
 16% 418
 —%
Bulk power and other2.1
 2.0
 5% 9.5
 (79%) 59
 98
 (40%) 377
 (74%)
Other33.9
 33.0
 3% 30.6
 8% 81
 80
 1% 81
 (1%)
Total revenues/sales1,493.3
 1,491.8
 —% 1,371.1
 9% 16,020
 15,960
 —% 16,178
 (1%)
Electric production fuel expense231.5
 193.9
 19% 193.8
 —%          
Energy purchases expense240.8
 188.2
 28% 150.7
 25%          
Purchased electric capacity expense25.0
 155.2
 (84%) 153.7
 1%          
Margins (c)
$996.0
 
$954.5
 4% 
$872.9
 9%          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.
(c)
Includes $85 million, $79 million and $83 million of credits on Iowa retail electric customers’ bills for 2014, 2013 and 2012, respectively, resulting from the electric tax benefit rider. The electric tax benefit rider resulted in reductions in electric revenues that were offset by reductions in income tax expense for 2014, 2013 and 2012.

Variances - Electric margins increased $42 million in 2014 and $82 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Electric Margins” for details of the variances in IPL’s electric margins.


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Refer to “Alliant Energy’s Results of Operations - Utility Electric Margins” for details of the definition of electric margins, IPL’s CDD and HDD data, estimated impacts of weather, purchased electric capacity expense, recoveries of fuel-related expense, sales trends and items impacting IPL’s electric margin forecast. Refer to “Rate Matters” for discussion of the IUB’s approval of IPL’s retail electric rate settlement agreement in September 2014, which includes a retail electric base rate freeze at IPL through the end of 2016. Refer to Note 2 for discussion of the electric tax benefit rider and revenue requirement adjustment. Refer to “Other Future Considerations” for discussion of a notification of termination of a wholesale power supply agreement provided to IPL by one of its wholesale customers.

Gas Margins - Gas margins and Dth sales for IPL were as follows:
 Revenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$162.5
 
$152.8
 6% 
$126.4
 21% 17,839
 16,975
 5% 12,955
 31%
Commercial96.1
 85.7
 12% 69.7
 23% 12,641
 12,051
 5% 9,403
 28%
Industrial17.4
 16.1
 8% 12.8
 26% 2,804
 2,931
 (4%) 2,435
 20%
Retail subtotal276.0
 254.6
 8% 208.9
 22% 33,284
 31,957
 4% 24,793
 29%
Transportation/other20.5
 19.3
 6% 17.8
 8% 31,377
 32,019
 (2%) 30,992
 3%
Total revenues/sales296.5
 273.9
 8% 226.7
 21% 64,661
 63,976
 1% 55,785
 15%
Cost of gas sold185.5
 160.3
 16% 124.9
 28%          
Margins (c)
$111.0
 
$113.6
 (2%) 
$101.8
 12%          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.
(c)
Includes $12 million and $11 million of credits on Iowa retail gas customers’ bills for 2014 and 2013, respectively, resulting from the gas tax benefit rider. The gas tax benefit rider resulted in reductions in gas revenues that were offset by reductions in income tax expense for 2014 and 2013.

Variances - Gas margins decreased $3 million in 2014 and increased $12 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Gas Margins” for details of the variances in IPL’s gas margins.

Refer to “Alliant Energy’s Results of Operations - Utility Gas Margins” for details of the definition of gas margins, estimated impacts of weather and discussion of the impacts on IPL’s gas margins of recoveries of natural gas costs. Refer to “Rate Matters” for discussion of IPL’s gas tax benefit rider and retail rate cases, including an interim retail gas base rate increase effective June 2012 and final retail gas base rate increase effective January 2013 for IPL’s Iowa customers.

Steam and Other Revenues - Steam and other revenues increased $5 million in 2014. Refer to “Alliant Energy’s Results of Operations - Utility Other Revenues” for IPL’s steam and other revenues variances.

Electric Transmission Service Expense - Electric transmission service expense increased $22 million in 2014 and $66 million in 2013. Refer to “Alliant Energy’s Results of Operations - Electric Transmission Service Expense” for IPL’s electric transmission service expense variances.

Refer to Notes 1(g) and 2 for additional information relating to recovery of electric transmission service expense.

Forecast - Refer to “Other Future Considerations” for discussion of a potential increase in future electric transmission service expense for IPL in 2015 compared to 2014.

Other Operation and Maintenance Expenses - Other operation and maintenance expenses increased $19 million in 2014 and $12 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Other Operation and Maintenance Expenses” for IPL’s other operation and maintenance expenses variances.

Depreciation and Amortization Expenses -
2014 vs. 2013 Summary - Depreciation and amortization expenses increased $6 million in 2014 primarily due to increased property additions, including various emission controls projects placed in service in the second half of 2013 and in 2014.

Forecast - IPL currently expects its depreciation and amortization expenses to increase in 2015 compared to 2014 due to property additions, including various emission controls projects placed in service in 2014 and expected to be placed in service in 2015.


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Interest Expense - Interest expense increased $9 million in 2014 and $3 million in 2013 primarily due to $12 million and $3 million of interest expense recorded in 2014 and 2013, respectively, for IPL’s $250 million 4.7% senior debentures issued in October 2013.

Forecast - IPL currently expects its interest expense to increase in 2015 compared to 2014 due to financings in 2014 and 2015. Refer to Note 9 for additional details of IPL’s financings in 2014 and “Liquidity and Capital Resources” for details of IPL’s financings anticipated in 2015.

AFUDC -
2014 vs. 2013 Summary - AFUDC increased $5 million in 2014 primarily due to increased CWIP balances related to Marshalltown and the emission controls projects at Ottumwa Unit 1.

2013 vs. 2012 Summary - AFUDC increased $13 million in 2013 primarily due to changes in AFUDC recognized for emission controls projects.

Refer to Note 3 for additional details of AFUDC recognized in 2014, 2013 and 2012.

Forecast - IPL currently expects AFUDC to increase in 2015 compared to 2014 primarily due to increased CWIP balances related to Marshalltown.

Income Taxes - Refer to Note 11 for details of IPL’s effective income tax rates, including discussion of the impacts of tax benefit riders, production tax credits, the effect of rate-making on property-related differences and a state apportionment change in 2012 related to the sale of RMT.

Forecast - IPL currently expects to record lower tax benefits from the effect of rate-making on property-related differences in 2015 compared to 2014 and lower tax benefits from the impacts of the electric tax benefit rider due to lower billing credits on Iowa retail electric customers’ bills expected in 2015 compared to 2014.

Preferred Dividend Requirements - Preferred dividend requirements decreased $6 million in 2014 and increased $4 million in 2013 primarily due to IPL recording charges of $5 million in 2013 related to the redemption of preferred stock. Refer to Note 8 for additional discussion of IPL’s preferred stock transactions.

WPL’S RESULTS OF OPERATIONS

Overview - WPL’s earnings available for common stock increased $4 million and $14 million in 2014 and 2013, respectively. The 2014 increase was the result of purchased electric capacity expense in 2013 as a result of the expiration of the Kewaunee PPA in December 2013. This item was partially offset by higher energy efficiency cost recovery amortizations, higher electric fuel-related costs and higher depreciation expense in 2014 compared to 2013. The 2013 increase was primarily due to purchased electric capacity expense related to the Riverside PPA that expired in December 2012, lower energy efficiency cost recovery amortizations and a lower effective tax rate. These items were partially offset by higher depreciation expense largely due to the purchase of Riverside in December 2012, lower gas revenues due to the impact of WPL’s retail gas base rate decrease effective in January 2013, higher electric transmission service costs from ATC and MISO and higher other operation and maintenance expenses.


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Electric Margins - Electric margins and MWh sales for WPL were as follows:
 Revenues and Costs (dollars in millions) MWhs Sold (MWhs in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$438.1
 $434.8 1% $446.0 (3%) 3,533
 3,552
 (1%) 3,538
 —%
Commercial247.8
 239.8
 3% 246.1
 (3%) 2,350
 2,314
 2% 2,307
 —%
Industrial340.5
 322.5
 6% 333.8
 (3%) 4,689
 4,498
 4% 4,439
 1%
Retail subtotal1,026.4
 997.1
 3% 1,025.9
 (3%) 10,572
 10,364
 2% 10,284
 1%
Sales for resale:    
   
          
Wholesale174.4
 165.4
 5% 159.8
 4% 3,101
 3,145
 (1%) 2,899
 8%
Bulk power and other0.8
 15.7
 (95%) 14.3
 10% 276
 665
 (58%) 926
 (28%)
Other18.7
 19.0
 (2%) 18.2
 4% 74
 72
 3% 70
 3%
Total revenues/sales1,220.3
 1,197.2
 2% 1,218.2
 (2%) 14,023
 14,246
 (2%) 14,179
 —%
Electric production fuel expense212.4
 237.1
 (10%) 173.4
 37%          
Energy purchases expense167.4
 105.8
 58% 194.4
 (46%)          
Purchased electric capacity expense0.1
 61.6
 (100%) 117.8
 (48%)          
Margins$840.4 $792.7 6% $732.6 8%          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.

Variances - Electric margins increased $48 million in 2014 and $60 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Electric Margins” for details of the variances in WPL’s electric margins.

Refer to “Alliant Energy’s Results of Operations - Utility Electric Margins” for details of the definition of electric margins, WPL’s CDD and HDD data, estimated impacts of weather, purchased electric capacity expense, recoveries of fuel-related expense, sales trends and items impacting WPL’s electric margin forecast. Refer to “Rate Matters” for discussion of a retail electric base rate case order received in July 2014, which includes a retail electric base rate freeze through the end of 2016. Refer to Note 2 for discussion of retail fuel-related rate increases effective January 1, 2014 and 2015. Refer to “Other Future Considerations” for discussion of recent notifications provided to WPL to terminate two of its wholesale power supply agreements.

Gas Margins - Gas margins and Dth sales for WPL were as follows:
 Revenues and Costs (dollars in millions) Dths Sold (Dths in thousands)
 2014 2013 (a) 2012 (b) 2014 2013 (a) 2012 (b)
Residential
$125.0
 
$109.7
 14% 
$97.9
 12% 13,879
 12,941
 7% 10,116
 28%
Commercial76.7
 64.6
 19% 54.6
 18% 10,660
 9,841
 8% 7,712
 28%
Industrial6.0
 5.0
 20% 3.9
 28% 906
 872
 4% 633
 38%
Retail subtotal207.7
 179.3
 16% 156.4
 15% 25,445
 23,654
 8% 18,461
 28%
Transportation/other13.3
 11.6
 15% 13.2
 (12%) 33,340
 28,242
 18% 26,540
 6%
Total revenues/sales221.0
 190.9
 16% 169.6
 13% 58,785
 51,896
 13% 45,001
 15%
Cost of gas sold142.3
 116.4
 22% 92.3
 26%          
Margins
$78.7
 
$74.5
 6% 
$77.3
 (4%)          

(a)
Reflects the % change from 2013 to 2014. (b) Reflects the % change from 2012 to 2013.

Variances - Gas margins increased $4 million in 2014 and decreased $3 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Gas Margins” for details of the variances in WPL’s gas margins.

Refer to “Alliant Energy’s Results of Operations - Utility Gas Margins” for details of the definition of gas margins, estimated impacts of weather and discussion of the impacts on WPL’s gas margins of recoveries of natural gas costs. Refer to “Rate Matters” for discussion of retail rate cases, including retail gas base rate decreases effective January 2013 and 2015.

Other Revenues - Other revenues decreased $10 million in 2014 and increased $14 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Other Revenues” for WPL’s other revenues variances.


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Electric Transmission Service Expense - Electric transmission service expense increased $7 million in 2014 and $11 million in 2013. Refer to “Alliant Energy’s Results of Operations - Electric Transmission Service Expense” for WPL’s electric transmission service expense variances.

Refer to Note 1(g) for additional information relating to recovery of electric transmission service expense.

Forecast - Refer to “Other Future Considerations” for discussion of a potential increase in future electric transmission service expense for WPL in 2015 compared to 2014.

Other Operation and Maintenance Expenses- Other operation and maintenance expenses increased $19 million in 2014 and $18 million in 2013. Refer to “Alliant Energy’s Results of Operations - Utility Other Operation and Maintenance Expenses” for WPL’s other operation and maintenance expenses variances.

Forecast - WPL currently expects its other operation and maintenance expenses to decrease in 2015 compared to 2014 primarily due to decreases in energy efficiency cost recovery amortizations approved by the PSCW in its July 2014 order, partially offset by expected increases in retirement plan costs in 2015 compared to 2014, resulting from decreases in discount rates and a change to the life expectancy assumption.

Depreciation and Amortization Expenses -
2014 vs. 2013 Summary - Depreciation and amortization expenses increased $9 million in 2014 primarily due to increased property additions, including various emission controls projects placed in service in 2014.

2013 vs. 2012 Summary - Depreciation and amortization expenses increased $31 million in 2013 primarily due to depreciation expense related to Riverside, the SCR project at Edgewater Unit 5, which was placed in service in the fourth quarter of 2012, and new depreciation rates implemented by WPL effective in January 2013.

Interest Expense -
2013 vs. 2012 Summary - Interest expense increased $5 million in 2013 primarily due to $5 million of higher interest expense recorded in 2013 compared to 2012 for WPL’s 2.25% debentures issued in November 2012 to fund a portion of the purchase price of Riverside.

Forecast - WPL currently expects its interest expense to increase in 2015 compared to 2014 due to financings in 2014. Refer to Note 9 for additional details of WPL’s financings in 2014.

AFUDC -
2013 vs. 2012 Summary - AFUDC decreased $4 million in 2013 primarily due to changes in AFUDC recognized for emission controls projects. Refer to Note 3 for details of AFUDC recognized in 2014, 2013 and 2012.

Income Taxes - Refer to Note 11 for details of WPL’s effective income tax rates, including discussion of the impacts of production tax credits and state apportionment changes in 2012 due to the sale of RMT.

LIQUIDITY AND CAPITAL RESOURCES

Overview - Alliant Energy, IPL and WPL expect to maintain adequate liquidity to operate their businesses and implement their strategic plan as a result of operating cash flows generated by their utility business, and available capacity under their revolving credit facilities and IPL’s sales of accounts receivable program, and operating cash flows generated by their utility business, supplemented by periodic issuances of long-term debt and Alliant Energy equity securities.

Liquidity Position - At December 31, 20142016, Alliant Energy had $578 million of cash and cash equivalents, $859756 million ($159108 million at the parent company, $300 million at IPL and $400348 million at WPL) of available capacity under theirthe revolving credit facilities and $128129 million of available capacity at IPL under its sales of accounts receivable program. Refer to “Short-term Debt” below and Note 9(a) for further discussion of the credit facilities. Refer to Note 5(b) for additional information on IPL’s sales of accounts receivable program.


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Capital Structure - Alliant Energy, IPL and WPL plan to maintain debt-to-total capitalization ratios that are consistent with their investment-grade credit ratings. Alliant Energy, IPL and WPL currently expect to maintain capital structures in which debt would not exceed 45% to 55% of total capital and preferred stock would not exceed 5% to 10% of total capital. These targets may be adjusted depending on subsequent developments and the impact on their respective WACC and investment-grade credit ratings. Capital structures at as of December 31, 20142016 were as follows (dollars in millions)(Common Equity (CE); IPL’s Preferred Stock (PS); Long-term Debt (including current maturities) (LD); Short-term Debt (SD)):
 Alliant Energy (Consolidated) IPL WPL
Common equity
$3,438.7
 45% 
$1,814.1
 48% 
$1,703.8
 52%
Preferred stock200.0
 3% 200.0
 5% 
 %
Noncontrolling interest1.8
 % 
 % 8.5
 %
Long-term debt (incl. current maturities)3,789.7
 50% 1,768.7
 47% 1,573.9
 48%
Short-term debt141.3
 2% 
 % 
 %
 
$7,571.5
 100% 
$3,782.8
 100% 
$3,286.2
 100%

Alliant Energy, IPL and WPL intend to manage their capital structures and liquidity positions in such a way that facilitates their ability to raise the necessary funds reliably and on reasonable terms and conditions, while maintaining financial capital structures consistent with those approved by regulators and necessary to maintain appropriate credit quality. In addition to capital structures, other important financial considerationsfactors used to determine the characteristics of future financings include anticipated proceeds from asset sales, financial coverage ratios, capital spending plans, regulatory orders and rate-making considerations, levels of debt imputed by rating agencies, market conditions and the impact of tax initiatives and legislation. The most significant debt imputations relate to the sales of accounts receivable program, the DAEC PPA, and pension and OPEB obligations. The PSCW factors certain imputed debt adjustments in establishing a regulatory capital structure as part of WPL’s retail rate cases. The IUB and MPUC dodoes not make any explicit adjustments for imputed debt in establishing capital ratios used in determining customer rates, although such adjustments are considered by IPL in recommending an appropriate capital structure. The most significant debt imputations relate to the DAEC PPA, pension and OPEB obligations and the sales of accounts receivable program.

Credit and Capital Markets - Alliant Energy, IPL and WPL are aware of the potential implications that credit and capital market disruptions might have on thetheir ability to raise external funding required for their respective operations and capital expenditure plans. Alliant Energy, IPL and WPL maintain revolving credit facilities to provide backstop liquidity to their commercial paper programs, and ensure a committed source of liquidity in the event the commercial paper market becomes disrupted and efficiently manage their long-term financings.disrupted. In addition, Alliant Energy and IPL maintainmaintains a sales of accounts receivable program at IPL as an alternative financing source.

Primary Sources and Uses of Cash - TheAlliant Energy’s most significant source of cash is from electric and gas sales to IPL’s and WPL’s customers. Cash from these sales reimburses IPL and WPL for prudently-incurred expenses to provide service to their utility customers and provides IPL and WPL a return of and a return on the assets used to provide such services. Utility operating cash flows are expected to cover the majority of IPL’s and WPL’s capital expenditures required to maintain their current infrastructure and to pay dividends paid to Alliant Energy’s shareowners. Capital needed to retire debt and fund capital expenditures related to large strategic projects is expected to be met primarily through external financings.

Cash Flows - Selected information from the cash flows statements was as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
201420132012 201420132012 201420132012201620152014 201620152014 201620152014
Cash and cash equivalents, January 1
$9.8

$21.2

$11.4
 
$4.4

$4.5

$2.1
 
$0.5

$0.7

$2.7

$5.8

$56.9

$9.8
 
$4.5

$5.3

$4.4
 
$0.4

$46.7

$0.5
Cash flows from (used for):          
Operating activities891.6
731.0
841.1
 406.1
232.6
291.0
 424.4
423.3
427.4
859.6
871.2
891.6
 361.9
385.0
406.1
 521.4
449.8
424.4
Investing activities(917.7)(754.7)(1,155.5) (552.7)(423.3)(331.2) (320.1)(335.9)(710.2)(1,186.5)(919.2)(917.7) (693.6)(511.9)(552.7) (478.9)(358.2)(320.1)
Financing activities73.2
12.3
324.2
 147.5
190.6
42.6
 (58.1)(87.6)280.8
329.3
(3.1)73.2
 330.5
126.1
147.5
 (38.7)(137.9)(58.1)
Net increase (decrease)47.1
(11.4)9.8
 0.9
(0.1)2.4
 46.2
(0.2)(2.0)2.4
(51.1)47.1
 (1.2)(0.8)0.9
 3.8
(46.3)46.2
Cash and cash equivalents, December 31
$56.9

$9.8

$21.2
 
$5.3

$4.4

$4.5
 
$46.7

$0.5

$0.7

$8.2

$5.8

$56.9
 
$3.3

$4.5

$5.3
 
$4.2

$0.4

$46.7


67

Table of Contents


Operating Activities -
20142016 vs. 20132015 - Alliant Energy’sThe following items contributed to increased (decreased) operating activity cash flows from operating activities increased $161 million primarily due to $190 million of lower purchased electric capacity payments in 20142016 compared to 2013 related to the previous DAEC PPA and the Kewaunee PPA, $94 million of higher cash flows from changes in the level of IPL’s accounts receivable sold during 2014 and 2013, and the final receipt of $26 million related to Alliant Energy’s tax separation and indemnification agreement with Whiting Petroleum in 2014. These items were partially offset by $72 million of retail electric customer base rate freeze billing credits at IPL in 2014, higher fuel-related costs at WPL in 2014 compared to 2013, and lower cash flows from increases in inventory levels of gas stored underground at IPL and WPL during 2014. Refer to Notes 5(b) and 5(c) for discussion of IPL’s sale of accounts receivable program and the tax separation and indemnification agreement with Whiting Petroleum, respectively. Refer to “Rate Matters” for further discussion of IPL’s retail electric customer base rate freeze billing credits. Refer to Note 2 for discussion of WPL’s under-collection of fuel-related costs during 2014.2015 (in millions):

IPL’s cash flows from operating activities increased $174 million primarily due to $129 million of lower purchased electric capacity payments in 2014 compared to 2013 related to the previous DAEC PPA and $94 million of higher cash flows from changes in the level of accounts receivable sold during 2014 and 2013. These items were partially offset by $72 million of retail electric customer base rate freeze billing credits in 2014.

WPL’s cash flows from operating activities increased $1 million primarily due to $61 million of purchased electric capacity payments in 2013 related to the Kewaunee PPA. This item was substantially offset by lower cash flows from higher fuel-related costs in 2014 compared to 2013 and lower cash flows from increases in inventory levels of gas stored underground.
 Alliant Energy IPL WPL
Decreased collections from IPL’s retail customers due to increased past due amounts
($33) 
($33) 
$—
Changes in cash collateral balances(27) 
 
Changes in income taxes (paid) refunded(10) (30) 35
Changes in the level of cash proceeds from IPL’s sales of accounts receivable33
 33
 
Timing of WPL’s fuel-related cost recoveries from customers (Refer to Note 2 for details)
17
 
 17
Changes in collections at IPL from higher revenues from retail electric customer billing credits related to the approved retail electric base rate freeze through 2016 (Refer to Note 2 for details)
15
 15
 
Other (includes other changes in working capital largely related to changes in inventory levels)(7) (8) 20
 
($12) 
($23) 
$72

20132015 vs. 20122014 - Alliant Energy’sThe following items contributed to increased (decreased) operating activity cash flows from operating activities decreased $110 million primarily due to $91 million of lower cash flows from changes in the level of IPL’s accounts receivable sold during 2013 and 2012, $63 million of cash flows from operations at RMT in 2012 due to changes in working capital requirements associated with renewable energy projects, lower cash flows from changes in prepaid gas and inventory levels of gas stored underground at IPL and WPL, and refunds paid by WPL to its retail electric customers during 2013 for over-collected fuel-related costs during 2012. These items were partially offset by $59 million of purchased electric capacity payments by WPL in 2012 related to the Riverside PPA, and the timing of electric fuel-related, natural gas and transmission cost recoveries at IPL.

IPL’s cash flows from operating activities decreased $58 million primarily due to $91 million of lower cash flows from changes in the level of accounts receivable sold in 20132015 compared to 2012 and lower cash flows from changes in prepaid gas and inventory levels of gas stored underground. These items were partially offset by the timing of electric fuel-related, natural gas and transmission cost recoveries.2014 (in millions):

WPL’s cash flows from operating activities decreased $4 million primarily due to $26 million of lower cash flows caused by income tax payments in 2013 and income tax refunds in 2012, refunds paid by WPL to its retail electric customers during 2013 for over-collected fuel-related costs during 2012, and lower cash flows from changes in prepaid gas and inventory levels of gas stored underground. These items were largely offset by $59 million of purchased electric capacity payments in 2012 related to the Riverside PPA.

Electric Fuel-related, Natural Gas and Transmission Cost Recoveries - IPL has cost recovery mechanisms applicable for its retail electric and gas customers to provide for subsequent adjustments to its electric and gas rates for changes in electric fuel-related and natural gas costs. IPL also has a cost recovery mechanism applicable for its Iowa retail electric customers to provide for subsequent adjustments to its electric rates for changes in electric transmission service expense. Changes in the timing of IPL’s electric fuel-related, natural gas and transmission cost recoveries resulted in $47 million of higher cash flows from operations for Alliant Energy and IPL in 2013 compared to 2012.
 Alliant Energy IPL WPL
Decreased collections from IPL’s and WPL’s retail customers caused by temperature impacts on electric and gas sales
($33) 
($17) 
($16)
Final receipt related to Alliant Energy’s tax separation and indemnification agreement with Whiting Petroleum in 2014 (Refer to Note 5(c) for details)
(26) 
 
Timing of WPL’s fuel-related cost recoveries from customers50
 
 50
Changes in collections at IPL from higher revenues from retail electric customer billing credits related to the approved retail electric base rate freeze (Refer to Note 2 for details)
48
 48
 
Other (includes other changes in working capital largely related to changes in inventory levels)(59) (52) (9)
 
($20) 
($21) 
$25

Income Tax Payments and Refunds - Income tax (payments) refunds were as follows (in millions):
2014 2013 20122016 2015 2014
IPL
$20
 
$—
 
($3)
($11) 
$19
 
$20
WPL(12) (23) 3
28
 (7) (12)
Other subsidiaries(3) 33
 20
(27) (12) (3)
Alliant Energy
$5
 
$10
 
$20

($10) 
$—
 
$5

Alliant Energy’s income tax refunds in 2014, 2013 and 2012 were primarily due to federal and state claims filed related to net operating losses carried back to prior years. Alliant Energy, IPL and WPL currently do not expect to make any significant federal income tax payments through 20172021 based on their current federal net operating loss and credit carryforward positions

68



and future amounts of bonus depreciation expected to be claimed on Alliant Energy’s U.S. federal income tax returns for calendar years 2014 and 2015.2016 through 2020. While no significant federal income tax payments through 20172021 are expected to occur, some tax payments and refunds may occur for state taxes and between consolidated group members (including IPL and WPL) under the tax sharing agreement between Alliant Energy and its subsidiaries. Refer to Note 11 for discussion of the carryforward positions.

Pension Plan Contributions - Alliant Energy, IPL and WPL currently do not expect to make any significant pension plan contributions in 2015 through2017 and 2018 based on the funded status and assumed return on assets for each plan as of the December 31, 20142016 measurement date. Refer to Note 12(a) for discussion of the current funded levels of pension plans.

Investing Activities -
2014 vs. 2013Transfer of ATC Investment - On December 31, 2016, pursuant to a PSCW order, WPL’s investment in ATC was transferred to ATI. The transfer will result in a reduction of WPL’s cash flows from operations related to WPL’s distributions from unconsolidated investments in 2017, as well as a reduction in WPL’s equity income from unconsolidated investments in 2017. The transfer is not expected to impact Alliant Energy’s cash flows used for investing activities increased $163 million primarily due to $107 million of higher utility construction expenditures and a $62 million cash grant Alliant Energy received in 2013 related to the Franklin County wind project. The higher utility construction expenditures were largely due to higher expenditures for Marshalltown, IPL’s and WPL’s electric and gas distribution systems and emission controls projects at WPL’s Edgewater Unit 5 in 2014, partially offset by lower expenditures for emission controls projects at WPL’s Columbia Units 1 and 2 in 2014.from operations or income statement. Refer to Note 5(d)6(a) for further discussion of the Franklin County wind project cash grant.transfer.

IPL’s
Investing Activities -
2016 vs. 2015 - The following items contributed to increased (decreased) investing activity cash flows used for investing activities increased $129 million duein 2016 compared to $126 million of higher construction expenditures. The higher construction expenditures were largely due to higher expenditures for Marshalltown and the electric and gas distribution systems in 2014.2015 (in millions):

WPL’s cash flows used for investing activities decreased $16 million primarily due to $19 million of lower construction expenditures. The lower construction expenditures were largely due to lower expenditures for emission controls projects at Columbia Units 1 and 2 in 2014, partially offset by higher expenditures for emission controls projects at Edgewater Unit 5 and the electric and gas distribution systems in 2014.
 Alliant Energy IPL WPL
Higher utility construction expenditures (largely due to higher expenditures for IPL’s expansion of wind generation, IPL’s and WPL’s electric and gas distribution systems and WPL’s Riverside expansion in 2016, partially offset by lower expenditures for IPL’s Marshalltown facility and environmental controls projects at WPL’s Edgewater Unit 5 in 2016)
($179) 
($70) 
($109)
Proceeds from IPL’s Minnesota distribution asset sales in 2015 (Refer to Note 3 for details)
(140) (140) 
Proceeds from the liquidation of company-owned life insurance policies in 201631
 19
 
Other21
 9
 (12)
 
($267) 
($182) 
($121)

20132015 vs. 20122014 - Alliant Energy’sThe following items contributed to increased (decreased) investing activity cash flows used for investing activities decreased $401 million primarily duein 2015 compared to $294 million of lower utility construction and acquisition expenditures, a $62 million cash grant Alliant Energy received during 2013 related to the Franklin County wind project, and expenditures in 2012 for the Franklin County wind project and Corporate Services’ purchase of its corporate headquarters building. The lower utility construction and acquisition expenditures were largely due to expenditures for WPL’s purchase of Riverside in 2012 and for emission controls projects at WPL’s Edgewater Unit 5 in 2012, partially offset by higher expenditures in 2013 for the emission controls projects at WPL’s Columbia Units 1 and 2, and IPL’s George Neal Units 3 and 4 and Lansing Unit 4.2014 (in millions):

IPL’s cash flows used for investing activities increased $92 million due to $93 million of higher construction expenditures. The higher construction expenditures were largely due to higher expenditures in 2013 for emission controls projects at George Neal Units 3 and 4 and Lansing Unit 4.

WPL’s cash flows used for investing activities decreased $374 million primarily due to $387 million of lower construction and acquisition expenditures. The lower construction and acquisition expenditures resulted from expenditures in 2012 for the purchase of Riverside and emission controls projects at Edgewater Unit 5. These items were partially offset by higher expenditures in 2013 for emission controls projects at Columbia Units 1 and 2.
 Alliant Energy IPL WPL
Proceeds from IPL’s Minnesota distribution asset sales in 2015 (Refer to Note 3 for details)

$140
 
$140
 
$—
Higher utility construction expenditures (largely due to higher expenditures for IPL’s Marshalltown facility and environmental controls projects at WPL’s Edgewater Unit 5 in 2015, partially offset by lower expenditures for environmental controls projects at IPL’s Ottumwa Unit 1 and WPL’s Columbia Units 1 and 2 in 2015)(125) (93) (31)
Other(17) (6) (7)
 
($2) 
$41
 
($38)

Construction and Acquisition Expenditures - CapitalConstruction and acquisition expenditures and financing plans are reviewed, approved and updated as part of the financial planning processes. Changes in anticipated construction and acquisition expenditures may result from a number of reasons including economic conditions, regulatory requirements, changing legislation, ability to obtain adequate and timely rate relief, improvements in technology, failure of generating facilities, improvements to ensure reliability of the electric and gas distribution systems, changing market conditions, customer and sales growth, funding of pension and OPEB plans, tax reform and new opportunities. Alliant Energy, IPL and WPL have not yet entered into contractual commitments relating to the majority of their anticipated future capitalconstruction and acquisition expenditures. As a result, they have some discretion with regard to the level and timing of capitalthese expenditures. ConstructionThe table below summarizes anticipated construction and acquisition expenditures are currently anticipated as follows (in millions):

69



 Alliant Energy IPL WPL
 2015201620172018 2015201620172018 2015201620172018
Utility (a):              
Generation:              
Marshalltown
$295

$180

$15

$—
 
$295

$180

$15

$—
 
$—

$—

$—

$—
WPL’s proposed Riverside expansion10
195
315
215
 



 10
195
315
215
Environmental compliance165
90
60
100
 30
10
25
85
 135
80
35
15
Maintenance and performance improvements135
165
160
115
 70
85
90
50
 65
80
70
65
Distribution:              
Electric systems255
270
305
295
 145
155
175
170
 110
115
130
125
Gas systems115
115
135
145
 65
70
80
100
 50
45
55
45
Other50
50
45
40
 25
20
20
20
 25
30
25
20
Total utility1,025
1,065
1,035
910
 
$630

$520

$405

$425
 
$395

$545

$630

$485
Corporate Services and other non-utility (b)50
35
35
45
          
 
$1,075

$1,100

$1,070

$955
          

(a)
Cost estimates represent IPL’s ortotal escalated construction expenditures and exclude AFUDC and capitalized interest, if applicable. Such estimates reflect impacts to Alliant Energy’s and WPL’s estimated portion of total escalated construction expenditures and exclude AFUDC, if applicable. Refer to “Strategic Overview” for further discussion of key projects impacting construction and acquisition plans related to the utility business.
(b)Cost estimates represent total escalated construction and acquisition expenditures and exclude capitalized interest.

ATC - WPL Transco’s capital contributionsexpenditures resulting from the intent to ATC are currently fundedexercise purchase options by ATI, and are included in “Corporate Services and other non-utility”certain electric cooperatives for a partial ownership interest in the table above. Alliant Energy currently anticipatesRiverside expansion, as well as additional capital expenditures related to Columbia that ATI will fund capital contributions of approximately $8 million, $19 million, $22 million and $4 million to ATC in 2015, 2016, 2017 and 2018, respectively, to help fund future proposed transmission projects. These future proposed transmission projects require approval from various regulatory agencies to construct. Certain of these future proposed transmission projects are currently being challenged by other utilities and other transmission-only companies who have requested to own a portion of the future transmission projects proposed by ATC. Alliant Energy and WPL are currently unable to determine the impact these challenges may have on ATC’s plans to construct these proposed transmission projects and the resulting impact on ATI’s future capital contributions to ATC and WPL’s and ATI’s equity earnings income and dividends received from ATC.

In 2011, Duke Energy Corporation and ATC announced the creation of Duke-American Transmission Co., a joint venture that is expected to build, ownincur related to agreements entered into with WPSC and operate new electric transmission infrastructure in North America. Duke-American Transmission Co. has announcedMGE. Refer to “Strategic Overview” for further discussion of certain key projects impacting construction of several new transmission lines overand acquisition plans related to the next decade for an aggregate cost of approximately $4 billion. These transmission projects are subject to approval by various regulatory agencies. Alliant Energy and WPL are currently unable to determine what impacts the joint venture and transmission line projects noted above, if constructed, will have on their future equity income, distributions from ATC, capital contributions to ATC, or ownership in ATC. The capital expenditures in the above table do not include any capital contributions for the potential Duke-American Transmission Co. projects.utility business.
 Alliant Energy IPL WPL
 2017201820192020 2017201820192020 2017201820192020
Generation:              
Renewable projects
$105

$310

$690

$260
 
$140

$290

$500

$150
 
$—

$20

$190

$110
Riverside expansion255
230
75
5
 



 255
230
75
5
Marshalltown50



 50



 



Other240
180
170
160
 85
85
85
85
 155
95
85
75
Distribution:              
Electric systems465
485
420
405
 280
310
240
235
 185
175
180
170
Gas systems130
125
95
220
 90
55
55
165
 40
70
40
55
Other155
115
110
105
 40
25
25
20
 20
15
15
15
 
$1,400

$1,445

$1,560

$1,155
 
$685

$765

$905

$655
 
$655

$605

$585

$430


Financing Activities -
20142016 vs. 20132015 - Alliant Energy’sThe following items contributed to increased (decreased) financing activity cash flows from financing activities increased $61 million primarily due to $810 million of proceeds from long-term debt issued in 2014 discussed in “Long-term Debt” below and payments of $211 million to redeem IPL’s and WPL’s cumulative preferred stock in 2013. These items were partially offset by $348 million of payments to retire long-term debt in 2014 discussed below, $250 million of proceeds from IPL’s issuance of 4.7% senior debentures in 2013, $200 million of proceeds from IPL’s issuance of cumulative preferred stock in 2013 and net changes in the amount of commercial paper outstanding at Alliant Energy, IPL and WPL.

IPL’s cash flows from financing activities decreased $43 million primarily due to $250 million of proceeds from the issuance of 4.7% senior debentures in 2013, $200 million of proceeds from the issuance of cumulative preferred stock in 2013, payments of $38 million to retire its 5% pollution control revenue bonds in 2014 and $30 million of lower capital contributions from its parent company during 20142016 compared to 2013. These items were partially offset by $250 million of proceeds from the issuance of 3.25% senior debentures in 2014, payments of $150 million to redeem cumulative preferred stock in 2013 and decreases in the amount of commercial paper outstanding in 2013.2015 (in millions):


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Table of Contents


WPL’s cash flows used for financing activities decreased $30 million primarily due to $250 million of proceeds from the issuance of 4.1% debentures in 2014 and payments of $61 million to redeem cumulative preferred stock in 2013, partially offset by changes in the amount of commercial paper outstanding.
 Alliant Energy IPL WPL
Proceeds from long-term debt issued in 2016 (Refer to “Long-term Debt” below)
$800
 
$300
 
$—
Payments to retire long-term debt in 2015 (Refer to “Long-term Debt” below)181
 150
 31
Net changes in the amount of commercial paper outstanding66
 
 13
Payments to retire long-term debt in 2016 (Refer to “Long-term Debt” below)(310) 
 
Proceeds from long-term debt issued in 2015 (Refer to “Long-term Debt” below)(250) (250) 
Lower net proceeds from common stock issuances(125) 
 
Higher capital contributions from IPL’s and WPL’s parent company, Alliant Energy
 25
 60
Other (includes higher dividend payments in 2016)(30) (21) (5)
 
$332
 
$204
 
$99

20132015 vs. 20122014 - Alliant Energy’sThe following items contributed to increased (decreased) financing activity cash flows from financing activities decreased $312 million primarily duein 2015 compared to the impacts of $385 million of proceeds from long-term debt issued in 2012 discussed in “Long-term Debt” below, payments of $211 million to redeem IPL’s and WPL’s cumulative preferred stock in 2013 and net changes in the amount of commercial paper outstanding at Alliant Energy, IPL and WPL. These items were partially offset by $250 million of proceeds from the issuance of 4.7% senior debentures by IPL in 2013 and $200 million of proceeds from IPL’s issuance of 5.1% cumulative preferred stock in 2013.2014 (in millions):

IPL’s cash flows from financing activities increased $148 million primarily due to $250 million of proceeds from the issuance of 4.7% senior debentures in 2013 and $200 million of proceeds from the issuance of 5.1% cumulative preferred stock in 2013. These items were partially offset by payments of $150 million to redeem 8.375% cumulative preferred stock in 2013 and changes in the amount of commercial paper outstanding.

WPL’s cash flows used for financing activities increased $368 million primarily due to the impacts of $250 million of proceeds from long-term debt issued in 2012 discussed below, $90 million of capital contributions in 2012 from its parent company, Alliant Energy, and payments of $61 million to redeem 4.4% through 6.5% cumulative preferred stock in 2013. These items were partially offset by changes in the amount of commercial paper outstanding.
 Alliant Energy IPL WPL
Proceeds from long-term debt issued in 2014 (Refer to “Long-term Debt” below)
($810) 
($250) 
($250)
Payments to retire long-term debt in 2015 (Refer to “Long-term Debt” below)(181) (150) (31)
Payments to retire long-term debt in 2014 (Refer to “Long-term Debt” below)348
 38
 
Proceeds from long-term debt issued in 2015 (Refer to “Long-term Debt” below)250
 250
 
Net changes in the amount of commercial paper outstanding157
 
 204
Net proceeds from common stock issuances in 2015151
 
 
Higher capital contributions from IPL’s parent company, Alliant Energy
 75
 
Other9
 16
 (3)
 
($76) 
($21) 
($80)

FERC and Public Utility Holding Company Act Financing Authorizations - Under the Public Utility Holding Company Act of 2005, FERC has authority over the issuance of utility securities, except to the extent that a public utility’s primary state regulatory commission has retained jurisdiction over such matters. FERC currently has authority over the issuance of securities by IPL. FERC does not have authority over the issuance of securities by Alliant Energy, WPL, ResourcesAEF or Corporate Services.

In 2013,2015, IPL received authorization from FERC through December 31, 20152017 for the following (in millions):
Initial Current
Initial Authorization Current Remaining AuthorityAuthorization Remaining Authority
Long-term debt securities issuances in aggregate
$750
 
$500

$550
 
$250
Short-term debt securities outstanding at any time (including borrowings from its parent)750
 750
300
 300
Preferred stock issuances in aggregate300
 300
300
 300

State Regulatory Financing Authorizations - In 2011,September 2016, WPL received authorization from the PSCW to have up to $400 million of short-term borrowings and/or letters of credit outstanding at any time through the earlier of the expiration date of WPL’s credit facility agreement (including extensions) or December 2018.2024. In November 2014,December 2016, WPL received authorization from the PSCW to issue up to $500 million$1 billion of long-term debt securities in aggregate during 2015 and 2016,2017 through 2019, with no more than $300$650 million to be issued in eitherany year.

In 2010, the MPUC issued an order that determined IPL does not need to obtain authorization to issue securities as long as IPL is not organized under the laws of the state of Minnesota and the securities issued do not encumber any of its property in the state of Minnesota. IPL currently does not have, and does not plan to issue, securities that encumber such property, thus IPL is not currently required to obtain approval from the MPUC for unsecured securities issuances. However, if in the future IPL were to subject its utility property in Minnesota to an encumbrance for the purpose of securing the payment of any indebtedness, IPL would be required to obtain an order from the MPUC approving such securities issuances.

Shelf Registrations - Alliant Energy, IPL and WPL have current shelf registration statements on file with the SEC for availability to issue unspecified amounts of securities through December 2017. Alliant Energy’s shelf registration statement may be used to issue common stock, debt and other securities. IPL’s and WPL’s shelf registration statements may be used to issue preferred stock and debt securities.

Common Stock Split -As discussed in Note 7, Alliant Energy’s Board of Directors approved a two-for-one common stock split, which was distributed in May 2016.

Common Stock Dividends - Payment of common stock dividends is subject to dividend declaration by Alliant Energy’s Board of Directors. Alliant Energy’s general long-term goal is to maintain a dividend payout ratio that is competitive with

the industry average. Based on that, Alliant Energy’s goal is to maintain a dividend payout ratio of approximately 60% to 70% of consolidated earnings from continuing operations. IPL’s and WPL’s goal is to maintain dividend payout ratios of approximately 65% to 75%. Alliant Energy’s, IPL’s and WPL’s dividend payout ratios were 59%71%, 76%70% and 66%71% of their consolidated earnings from continuing operations in 2014,2016, respectively. Refer to “Financing Forecast” belowExecutive Overview for discussion

71

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of expected common stock dividends in 2015.2017. Refer to Note 7 for discussion of IPL’s and WPL’s dividend payment restrictions based on the terms of applicable regulatory limitations and IPL’s outstanding preferred stock.

Common Stock Issuances and Capital Contributions - Refer to Note 7 for discussion of common stock issuances by Alliant Energy issued a modest amount of additional common stock in 20122014 through 2014 under its equity-based compensation plans for employees.2016. Refer to “Financing Forecast” belowExecutive Overview for discussion of expected issuances of common stock and capital contributions in 2015. Refer to Note 7 for discussion of capital contributions from Alliant Energy to each of IPL, WPL and Corporate Services; payments of common stock dividends by IPL and WPL to their parent company; and repayments of capital by Resources to its parent company.

Preferred Stock Issuance and Redemptions - Refer to Note 8 for discussion of IPL’s and WPL’s preferred stock redemptions and IPL’s issuance of preferred stock in 2013.2017.

Short-term Debt - Alliant Energy, IPL and WPL maintain committed revolving credit facilities to provide short-term borrowing flexibility and backstop liquidity for commercial paper outstanding. At December 31, 2014,2016, Alliant Energy’s short-term borrowing arrangements included three revolving credit facilities totaling $1 billion ($300 million for Alliant Energy at the parent company level, $300 million for IPL and $400 million for WPL). There are currently 13 lenders that participate in the three credit facilities, with aggregate respective commitments ranging from $10 million to $135 million. In 2014, eachEach of the credit facilities was extended one year throughexpire in December 2018. There2018 and there are currently no extension renewal provisions remaining for the credit facilities. Each of the credit facilities has a provision to expand the facility size up to $100 million, subject to lender approval for Alliant Energy and IPL, and subject to lender and regulatory approvals for IPL and WPL. During 2014,2016, the Alliant Energy parent company, IPL and WPL issued commercial paper to meet short-term financing requirements and did not borrow directly under their respective credit facilities.

Alliant Energy’s, IPL’s and WPL’s credit facility agreements each contain a financial covenant, which requires the entities to maintain certain debt-to-capital ratios in order to borrow under the credit facilities. The debt-to-capital ratios cannot exceed 65%, 58% and 58% for Alliant Energy, IPL and WPL, respectively. The debt component of the capital ratios includes long- and short-term debt (excluding non-recourse debt and hybrid securities to the extent the total carrying value of such hybrid securities does not exceed 15% of consolidated capital of the applicable borrower), capital lease obligations, letters of credit, guarantees of the foregoing and new synthetic leases. Unfunded vested benefits under qualified pension plans and sales of accounts receivable are not included in the debt-to-capital ratios. The equity component of the capital ratios excludes accumulated other comprehensive income (loss).

The credit agreements contain provisions that prohibit placing liens on any of Alliant Energy’s, IPL’s or WPL’s property or their respective subsidiaries with certain exceptions. Exceptions include among others, liens to secure obligations of up to 5% of the consolidated assets of the applicable borrower (valued at carrying value), liens imposed by government entities, materialmens’ and similar liens, judgment liens, and liens to secure additional non-recourse debt not to exceed $100 million outstanding at any one time at each of IPL and WPL, and $100 million at Alliant Energy’s non-utility subsidiaries, and purchase money liens.

The credit agreements contain provisions that require, during their term, any proceeds from asset sales, with certain exclusions, in excess of 20% of Alliant Energy’s, IPL’s and WPL’s respective consolidated assets be used to reduce commitments under their respective facilities. Exclusions include, among others, certain sale and lease-back transactions and sales of non-regulated assets and accounts receivable.

The credit agreements contain customary events of default. Alliant Energy’s credit agreement contains a cross-default provision that would be triggered if Alliant Energy or any domestic, majority-owned subsidiary of Alliant Energy defaults on debt (other than non-recourse debt) totaling $50 million or more. Accordingly, a cross-default provision would be triggered under the Alliant Energy credit agreement if IPL or WPL, as applicable, or a majority-owned subsidiary accounting for 20% or more of IPL’s or WPL’s, as applicable, consolidated assets (valued at carrying value), defaults on debt totaling $50 million or more. A default by a minority-owned subsidiary and, in the case of the Alliant Energy credit agreement, a default by a foreign subsidiary would not trigger a cross-default. A default by Alliant Energy, Corporate Services or ResourcesAEF and its subsidiaries would not trigger a cross-default under either the IPL or WPL credit agreements, nor would a default by either of IPL or WPL constitute a cross-default event for the other. If an event of default under any of the credit agreements occurs and is continuing, then the lenders may declare any outstanding obligations under the credit agreements immediately due and payable. In addition, if any order for relief is entered under bankruptcy laws with respect to Alliant Energy, IPL or WPL, then any outstanding obligations under the respective credit agreements would be immediately due and payable. In addition, IPL’s sales of accounts receivable program agreement contains a cross-default provision that is triggered if IPL or Alliant Energy incurs an event of default on debt totaling $50 million or more. If an event of default under IPL’s sales of accounts

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receivable program agreement occurs, then the counterparty could terminate such agreement. Refer to Note 5(b) for additional information on amounts outstanding under IPL’s sales of accounts receivable program.

A material adverse change representation is not required for borrowings under the credit agreements.

Refer to Note 9(a) for discussion of financial covenants required under the credit agreements, as well as additional information on the credit facilities and commercial paper outstanding. At December 31, 2014,2016, Alliant Energy, IPL and WPL were in compliance with all material covenants and other provisions of the credit agreements.

Refer to Note 9(a) for additional information on the credit facilities, commercial paper outstanding and debt-to-capital ratios.

Long-term Debt - In 2014, 2013 and 2012, significantSignificant issuances of long-term debt in 2016, 2015 and 2014 were as follows (dollars in millions):
Company Principal Amount Type Interest Rate Maturity Date Use of Proceeds Principal Amount Type Interest Rate Maturity Date Use of Proceeds
2016:   
AEF 
$500
 Variable-rate term loan credit agreement 1% at December 31, 2016 Oct-2018 Retire borrowings under Alliant Energy’s and Franklin County Holdings LLC’s variable-rate term loan credit agreements that matured in 2016, reduce outstanding commercial paper and for general corporate purposes
IPL 300
 Senior debentures 3.7% Sep-2046 Reduce cash amounts received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt and for general corporate purposes
2015:   
IPL 250
 Senior debentures 3.4% Aug-2025 Reduce commercial paper classified as long-term debt, reduce cash amounts received from its sales of accounts receivable program and for general corporate purposes
2014:      
Alliant Energy 
$250
 Variable-rate term loan credit agreement 1% at December 31, 2014 Oct-2016 Retire its $250 million, 4% senior notes due 2014 250
 Variable-rate term loan credit agreement 1% at December 31, 2015 Oct-2016 Retire its $250 million, 4% senior notes due 2014
IPL 250
 Senior debentures 3.25% Dec-2024 Reduce cash proceeds received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt and for general corporate purposes 250
 Senior debentures 3.25% Dec-2024 Reduce cash amounts received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt and for general corporate purposes
WPL 250
 Debentures 4.1% Oct-2044 Reduce commercial paper and for general corporate purposes 250
 Debentures 4.1% Oct-2044 Reduce commercial paper and for general corporate purposes
Franklin County Holdings LLC 60
 Variable-rate term loan credit agreement 1% at December 31, 2014 Dec-2016 Retire borrowings under a term loan credit agreement that matured in December 2014 60
 Variable-rate term loan credit agreement 1% at December 31, 2015 Dec-2016 Retire borrowings under a term loan credit agreement that matured in December 2014
2013:   
IPL 250
 Senior debentures 4.7% Oct-2043 Reduce cash proceeds received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt and for general corporate purposes
2012:   
WPL 250
 Debentures 2.25% Nov-2022 Fund a portion of the purchase price of Riverside
Corporate Services 75
 Senior notes 3.45% Sep-2022 Repay short-term debt primarily incurred for the purchase of the corporate headquarters building and for general corporate purposes
Franklin County Holdings LLC 60
 Variable-rate term loan credit agreement 1% at December 31, 2013 Dec-2014 Fund a portion of the costs of the Franklin County wind project

In 2014, significant retirements of long-term debt were as follows (dollars in millions):
Company Principal Amount Type Interest Rate Original Due Date
Alliant Energy 
$250
 Senior notes 4% Oct-2014
Franklin County Holdings LLC 60
 Variable-rate term loan credit agreement 1% at December 31, 2013 Dec-2014
IPL 38
 Pollution control revenue bonds 5% Jul-2014

Alliant Energy’s $250 million term loan credit agreement and Franklin County Holdings LLC’s $60AEF’s $500 million term loan credit agreement (with Alliant Energy as guarantor) includeincludes substantially the same covenants, including Alliant Energy maintaining a debt-to-capital ratio not to exceed 65% on a consolidated basis and events of default (except for a cross-default provision triggered at $100 million), that are included in Alliant Energy’s revolving credit facility financial covenant discussion abovediscussed in “Short-term Debt.”Note 9(a). At December 31, 2014,2016, Alliant Energy was in compliance with all material covenants and other provisions of the term loan credit agreements.agreement.

Significant retirements of long-term debt in 2016, 2015 and 2014 were as follows (dollars in millions):
Company Principal Amount Type Interest Rate Retirement Date
2016:        
Alliant Energy 
$250
 Variable-rate term loan credit agreement 1% at December 31, 2015 Oct-2016
Franklin County Holdings LLC 60
 Variable-rate term loan credit agreement 1% at December 31, 2015 Oct-2016
2015:        
IPL 150
 Senior debentures 3.3% Jun-2015
WPL 16
 Pollution control revenue bonds 5% Sep-2015
WPL 15
 Pollution control revenue bonds 5.375% Aug-2015
2014:        
Alliant Energy 250
 Senior notes 4% Oct-2014
Franklin County Holdings LLC 60
 Variable-rate term loan credit agreement 1% at December 31, 2013 Dec-2014
IPL 38
 Pollution control revenue bonds 5% Jul-2014

Refer to Note 9(b) for further discussion of long-term debt.


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Financing Forecast - The following financing activities are currently anticipated to occur in the future. The financing activities of Alliant Energy and IPL are contingent on the completion of the sale of IPL’s Minnesota electric and natural gas distribution assets in 2015.

Long-term Debt - IPL currently expects to issue up to $300 million of additional long-term debt in 2015. IPL’s $150 million, 3.3% senior debentures mature in 2015.
Common Stock Issuances and Capital Contributions - Alliant Energy currently expects to issue approximately $150 million of common stock in 2015 through one or more offerings and its Shareowner Direct Plan. IPL currently expects to receive capital contributions of $175 million from its parent company in 2015.
Common Stock Dividends - In November 2014, Alliant Energy announced an increase in its targeted 2015 annual common stock dividend to $2.20 per share, which is equivalent to a quarterly rate of $0.55 per share, beginning with the February 2015 dividend payment. The timing and amount of future dividends is subject to an approved dividend declaration from its Board of Directors, and is dependent upon earnings expectations, capital requirements, and general financial business conditions, among other factors. In addition, IPL and WPL currently expect to pay common stock dividends of approximately $140 million and $127 million, respectively, to their parent company in 2015.

Impact of Credit Ratings on Liquidity and Collateral Obligations -
Ratings Triggers - The long-term debt of Alliant Energy and its subsidiaries is not subject to any repayment requirements as a result of explicit credit rating downgrades or so-called “ratings triggers.” However, Alliant Energy and its subsidiaries are parties to various agreements that contain provisions dependent on credit ratings. In the event of a significant downgrade, Alliant Energy or its subsidiaries may need to provide credit support, such as letters of credit or cash collateral equal to the amount of the exposure, or may need to unwind the contract or pay the underlying obligation. In the event of a significant downgrade, management believes Alliant Energy, IPL and WPL have sufficient liquidity to cover counterparty credit support or collateral requirements under these various agreements. In addition, a downgrade in the credit ratings of Alliant Energy,

IPL or WPL could also result in them paying higher interest rates in future financings, reduce their pool of potential lenders, increase their borrowing costs under existing credit facilities or limit their access to the commercial paper market. Alliant Energy, IPL and WPL are committed to taking the necessary steps required to maintain investment-grade credit ratings. Credit ratings and outlooks as of the date of this report are as follows:
  Standard & Poor’s Ratings Services Moody’s Investors Service
Alliant Energy:Corporate/issuerA- A3Baa1
 Commercial paperA-2 P-2
 Senior unsecured long-term debtBBB+N/A A3Baa1
 OutlookStable Stable
IPL:Corporate/issuerA- A3Baa1
 Commercial paperA-2 P-2
 Senior unsecured long-term debtA- A3Baa1
 Preferred stockBBB Baa2Baa3
 OutlookStable Stable
WPL:Corporate/issuerA A1A2
 Commercial paperA-1 P-1
 Senior unsecured long-term debtA A1A2
 OutlookStable Stable

Credit ratings are not recommendations to buy or sell securities and are subject to change, and each rating should be evaluated independently of any other rating. Each of Alliant Energy, IPL or WPL assumes no obligation to update their respective credit ratings. Refer to Note 15 for additional information on ratings triggers for commodity contracts accounted for as derivatives.

Off-Balance Sheet Arrangements -
Special Purpose Entities - IPL maintains a Receivables Agreement whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. In 2014, 2013March 2016, IPL extended through March 2018 the purchase commitment from the third party to which it sells its receivables. In 2016, 2015 and 2012,2014, IPL evaluated the third party that purchases IPL’s receivable assets under the Receivables Agreement and believes that the third party is a VIE. However, IPL concluded consolidation of the third party was not required. Refer to Note 5(b) for information regarding IPL’s sales of accounts receivable program.

Guarantees and Indemnifications - Alliant Energy hasand IPL have guarantees and indemnifications outstanding at December 31, 20142016 related to its prior divestiture activities. Refer to Note 16(d) for additional information.

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Certain Financial Commitments -
Contractual Obligations - Consolidated long-term contractual obligations as of December 31, 20142016 were as follows (in millions):
Alliant Energy2015 2016 2017 2018 2019 Thereafter Total2017 2018 2019 2020 2021 Thereafter Total
Operating expense purchase obligations (Note 16(b)):
             
Purchased power and fuel commitments (a)
$492
 
$318
 
$252
 
$214
 
$153
 
$886
 
$2,315
SO2 emission allowances12
 14
 8
 
 
 
 34
Other (b)10
 1
 
 
 
 
 11
Operating expense purchase obligations (Note 16(b))

$529
 
$389
 
$297
 
$237
 
$220
 
$728
 
$2,400
Long-term debt maturities (Note 9(b))
183
 313
 5
 356
 256
 2,690
 3,803
5
 856
 256
 357
 8
 2,875
 4,357
Interest - long-term debt obligations179
 174
 172
 172
 147
 2,015
 2,859
199
 197
 167
 151
 140
 2,074
 2,928
Capital purchase obligations (Note 16(a))
25
 
 
 
 
 
 25
58
 
 
 
 
 
 58
Operating leases (Note 10(a))
8
 7
 3
 2
 1
 21
 42
6
 6
 2
 2
 1
 15
 32
Capital leases1
 1
 
 
 
 
 2
2
 1
 1
 1
 1
 
 6

$910
 
$828
 
$440
 
$744
 
$557
 
$5,612
 
$9,091

$799
 
$1,449
 
$723
 
$748
 
$370
 
$5,692
 
$9,781
IPL2015 2016 2017 2018 2019 Thereafter Total2017 2018 2019 2020 2021 Thereafter Total
Operating expense purchase obligations (Note 16(b)):
             
Purchased power and fuel commitments (a)
$288
 
$193
 
$163
 
$144
 
$145
 
$886
 
$1,819
SO2 emission allowances12
 14
 8
 
 
 
 34
Other (b)6
 
 
 
 
 
 6
Operating expense purchase obligations (Note 16(b))

$322
 
$225
 
$209
 
$176
 
$172
 
$670
 
$1,774
Long-term debt maturities (Note 9(b))
150
 
 
 350
 
 1,275
 1,775

 350
 
 200
 
 1,625
 2,175
Interest - long-term debt obligations90
 87
 87
 87
 63
 926
 1,340
107
 107
 83
 83
 75
 1,117
 1,572
Capital purchase obligations (Note 16(a))
6
 
 
 
 
 
 6
3
 
 
 
 
 
 3
Operating leases (Note 10(a))
3
 2
 2
 1
 1
 15
 24
3
 2
 1
 1
 1
 10
 18
Capital leases
 1
 
 
 
 
 1
1
 
 
 
 
 
 1

$555
 
$297
 
$260
 
$582
 
$209
 
$3,102
 
$5,005

$436
 
$684
 
$293
 
$460
 
$248
 
$3,422
 
$5,543

WPL2015 2016 2017 2018 2019 Thereafter Total2017 2018 2019 2020 2021 Thereafter Total
Operating expense purchase obligations (Note 16(b)):
             
Purchased power and fuel commitments (a)
$204
 
$125
 
$89
 
$70
 
$8
 
$—
 
$496
Other (b)2
 1
 
 
 
 
 3
Operating expense purchase obligations (Note 16(b))

$206
 
$162
 
$85
 
$59
 
$46
 
$53
 
$611
Long-term debt maturities (Note 9(b))
31
 
 
 
 250
 1,300
 1,581

 
 250
 150
 
 1,150
 1,550
Interest - long-term debt obligations81
 80
 80
 80
 80
 1,074
 1,475
80
 80
 80
 64
 60
 951
 1,315
Capital purchase obligations (Note 16(a))
19
 
 
 
 
 
 19
55
 
 
 
 
 
 55
Operating leases (Note 10(a))
4
 5
 1
 
 
 
 10
3
 4
 
 
 
 
 7
Capital lease - Sheboygan Falls (Note 10(b))
15
 15
 15
 15
 15
 83
 158
15
 15
 15
 15
 15
 53
 128
Capital leases - other1
 
 
 
 
 
 1
1
 1
 1
 1
 1
 
 5

$357
 
$226
 
$185
 
$165
 
$353
 
$2,457
 
$3,743

$360
 
$262
 
$431
 
$289
 
$122
 
$2,207
 
$3,671

(a)
Purchased power and fuel commitments represent normal business contracts used to ensure adequate purchased power, coal and natural gas supplies, and to minimize exposure to market price fluctuations. Alliant Energy, through its subsidiary Corporate Services, entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of December 31, 2014 regarding expected future usage, which is subject to change.
(b)
Other operating expense purchase obligations represent individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2014.

At December 31, 2014,2016, Alliant Energy, IPL and WPL had no uncertain tax positions recorded as liabilities. Refer to Note 12(a) for anticipated pension and OPEB funding amounts, which are not included in the above tables. Refer to “Construction and Acquisition Expenditures” above for additional information on construction and acquisition programs. In addition, at December 31, 2014,2016, there were various other liabilities included on the balance sheets that, due to the nature of the liabilities, the timing of payments cannot be estimated and are therefore excluded from the above tables.


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OTHER MATTERS

Market Risk Sensitive Instruments and Positions - Primary market risk exposures are associated with commodity prices, investment prices and interest rates. Risk management policies are used to monitor and assist in mitigating these market risks and derivative instruments are used to manage some of the exposures related to commodity prices. Refer to Notes 1(h) and 15 for further discussion of derivative instruments.

Commodity Price - Alliant Energy, IPL and WPL are exposed to the impact of market fluctuations in the price and transportation costs of commodities they procure and market. Established policies and procedures mitigate risks associated with these market fluctuations, including the use of various commodity derivatives and contracts of various durations for the forward sale and purchase of these commodities. Exposure to commodity price risks in the utility businesses is also significantly mitigated by current rate-making structures in place for recovery of fuel-related costs as well as the cost of natural gas purchased for resale. IPL’s electric and gas tariffs and WPL’s wholesale electric and gas tariffs provide for subsequent monthly adjustments to their tariff rates for material changes in prudently incurred commodity costs. IPL’s and WPL’s rate mechanisms, combined with commodity derivatives, significantly reduce commodity risk associated with their electric and gas margins.

WPL’s retail electric margins have the most exposure to the impact of changes in commodity prices due largely to the current retail recovery mechanism in place in Wisconsin for fuel-related costs. The cost recovery mechanism applicable for WPL’s retail electric customers is based on forecasts of fuel-related costs expected to be incurred during forward-looking test year periods and fuel monitoring ranges determined by the PSCW during each retail electric rate proceeding or in a separate fuel cost plan approval proceeding. Under this cost recovery mechanism, if WPL’s actual fuel-related costs fall outside this fuel monitoring range during the test period, WPL is authorized to defer the incremental under-/over-collection of fuel-related costs from retail electric customers that are outside the approved ranges. Deferral of under-collection of fuel-related costs are reduced to the extent WPL’s return on common equity during the fuel cost plan year exceeds the most recently authorized return on common equity. Refer to Note 2 for discussion of amounts recorded by Alliant Energy and WPL on their balance sheets as of December 31, 2014 for fuel-related costs incurred by WPL during 2014 that fell outside the approved bandwidth for 2014.

In December 2014,2016, the PSCW approved annual forecasted fuel-related costs per MWh of $28.00$26.15 based on $386$361 million of variable fuel-related costs applicable for retail and wholesale customers for WPL’s 2015 test period.2017 Test Period. The retail portion of the 20152017 fuel-related costs will be monitored using an annual bandwidth of plus or minus 2%. Based on the cost recovery mechanism in Wisconsin, the annual forecasted fuel-related costs approved by the PSCW in December 20142016 and an annual bandwidth of plus or minus 2%, Alliant Energy and WPL currently estimate the commodity risk exposure to their retail electric margins in 20152017 is approximately $6 million. However, if WPL’s return on common equity in 20152017 exceeds the most recently authorized return on common equity, the commodity risk exposure to WPL’s electric margins in 20152017 could increase.

Refer toNote 2 for discussion of WPL’s retail fuel-related rate filings for Test Years 2014 through 2016, and Note 1(g) for additional details of utility cost recovery mechanisms that significantly reduce commodity risk.

Investment Price - Alliant Energy, IPL and WPL are exposed to investment price risk as a result of their investments in securities, largely related to securities held by their pension and OPEB plans. Refer to Note 12(a) for details of the securities held by their pension and OPEB plans. Refer to “Critical Accounting Policies and Estimates” for the impact on retirement plan costs of changes in the rate of returns earned by plan assets.

Interest Rate - Alliant Energy, IPL and WPL are exposed to risk resulting from changes in interest rates when issuingassociated with variable-rate borrowings. In addition, Alliant Energy and IPL are exposed to risk resulting from changes in interest rates as a result of cash proceedsamounts outstanding under IPL’s sales of accounts receivable program. Assuming the impact of a hypothetical 100 basis point increase in interest rates on variable-rate borrowings and cash proceeds outstanding under IPL’s sales of accounts receivable program at December 31, 20142016, Alliant Energy’s, IPL’s and WPL’s annual pre-tax expense would increase by approximately $5$8 million, $0 and $0,$1 million, respectively.

Refer to Notes 5(b) and 9 for additional information on cash proceeds outstanding under IPL’s sales of accounts receivable program, and short- and long-term variable-rate

borrowings, respectively. Refer to “Critical Accounting Policies and Estimates” for the impacts of changes in discount rates on retirement plan obligations and costs.

New Accounting PronouncementsStandards - Refer to Note 1(p)1(o) for discussion of new accounting pronouncementsstandards impacting Alliant Energy, IPL and WPL.


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Critical Accounting Policies and Estimates - The preparation of financial statements in conformity with GAAP requires that management to apply accounting policies and make estimates that affect results of operations and the amounts of assets and liabilities reported in the financial statements. The following accounting policies and estimates are critical to the business and the understanding of financial results as they require critical assumptions and judgments by management. The results of these assumptions and judgments form the basis for making estimates regarding the results of operations and the amounts of assets and liabilities that are not readily apparent from other sources. Actual financial results may differ materially from these estimates. Management has discussed these critical accounting policies and estimates with the Audit Committee.Committee of the Board of Directors. Refer to Note 1 for additional discussion of accounting policies and the estimates used in the preparation of the financial statements.

Contingencies - Assumptions and judgments are made each reporting period regarding the future outcome of contingent events and lossevents. Loss contingency amounts are recorded for any contingent events that are bothfor which the likelihood of loss is probable and able to be reasonably estimated based upon current available information. The amounts recorded may differ from the actual income or expense that occursactuals when the uncertainty is resolved. The estimates made in accounting for contingencies, and the gains and losses that are recorded upon the ultimate resolution of these uncertainties, could have a significant effect on results of operations and the amount of assets and liabilities in the financial statements. Note 16 provides discussion of contingencies assessed at December 31, 20142016, including various pending legal proceedings, guarantees and indemnifications that may have a material impact on financial condition and results of operations.

Regulatory Assets and Regulatory Liabilities - Alliant Energy’s utility subsidiaries (IPLIPL and WPL)WPL are regulated by various federal and state regulatory agencies. As a result, they are subject to GAAP for regulated operations, which recognizes that the actions of a regulator can provide reasonable assurance of the existence of an asset or liability. Regulatory assets or regulatory liabilities arise as a result of a difference between GAAP and actions imposed by the regulatory agencies in the rate-making process. Regulatory assets generally represent incurred costs that have been deferred as such costs are probable of recovery in future customer rates. Regulatory liabilities generally represent obligations to make refunds to customers or amounts collected in rates for which the related costs have not yet been incurred. Regulatory assets and regulatory liabilities are recognized in accordance with the rulings of applicable federal and state regulators, and future regulatory rulings may impact the carrying value and accounting treatment of regulatory assets and regulatory liabilities.

Assumptions and judgments are made each reporting period regarding whether regulatory assets are probable of future recovery and regulatory liabilities are probable future obligations by considering factors such as regulatory environment changes, rate orders issued by the applicable regulatory agencies, and historical decisions by such regulatory agencies regarding similar regulatory assets and regulatory liabilities.liabilities, and subsequent events of such regulatory agencies. The decisions made by regulatory authorities have an impact on the recovery of costs, the rate of return on invested capital and the timing and amount of assets to be recovered by rates. A change in these decisions may result in a material impact on results of operations and the amount of assets and liabilities in the financial statements. Note 2 provides details of the nature and amounts of regulatory assets and regulatory liabilities assessed at December 31, 2014 as well as material changes to regulatory assets and regulatory liabilities during 20142016.

Long-Lived Assets - Periodic assessments regarding the recoverability of certain long-lived assets are completed when factors indicate the carrying value of such assets may be impaired or such assets are planned to be sold. These assessments require significant assumptions and judgments by management. The long-lived assets assessed for impairment generally include assets within non-regulated operations that are proposed to be sold or are currently generating operating losses, and certain long-lived assets within regulated operations that may not be fully recovered from IPL’s and WPL’s customers as a result of regulatory decisions in the future.future, and assets within non-regulated operations that are proposed to be sold or are currently generating operating losses.

Regulated Operations - Certain long-lived assets within regulated operations are reviewed for possible impairment whenever events or changes in circumstances indicate all or a portion of the carrying value of the assets may be disallowed for rate-making purposes. If IPL or WPL is disallowed recovery of any portion of the carrying value of its regulated property, plant and equipment that is under construction, has been recently completed or is probable of being retired early, an impairment charge is recognized equal to the amount of the carrying value that was disallowed recovery. If IPL or WPL is disallowed a full or partial return on the carrying value of its regulated property, plant and equipment that is under construction, has been recently completed or is probable of being retired early, an impairment charge is recognized equal to the difference between

the carrying amount of the asset and the present value of the future revenues expected from its regulated property, plant and equipment. Alliant Energy’s, IPL’s and WPL’s long-lived assets within their regulated operations that were assessed for impairment and plant abandonment in 2016 included IPL’s and WPL’s generating units subject to early retirement.

Generating Units Subject to Early Retirement - Alliant Energy, IPL and WPL evaluate future plans for their electric generation fleet and have announced the early retirement of certain older and less-efficient EGUs. When it becomes probable that an EGU will be retired before the end of its useful life, Alliant Energy, IPL and WPL must assess whether the EGU meets the criteria to be considered probable of abandonment. EGUs that are considered probable of abandonment generally have material remaining net book values and are expected to cease operations in the near term significantly before the end of their original estimated useful lives. If an EGU meets such criteria to be considered probable of abandonment, Alliant Energy, IPL and WPL must assess the probability of full recovery of the remaining carrying value of such EGU. If it is probable that regulators will not allow full recovery of and a full return on the remaining net book value of the abandoned EGU, an impairment charge is recognized equal to the difference between the remaining carrying value and the present value of the future revenues expected from the abandoned EGU.

Alliant Energy and IPL concluded that Sutherland Unit 3 met the criteria to be considered probable of abandonment as of December 31, 2016. IPL is currently allowed a full recovery of and a full return on this EGU from both its retail and wholesale customers, and as a result, Alliant Energy and IPL concluded that no impairment was required as of December 31, 2016.

Alliant Energy, IPL and WPL evaluated their other EGUs that are subject to early retirement and determined that no other EGUs met the criteria to be considered probable of abandonment as of December 31, 2016. Refer to “Strategic Overview” for discussion of additional EGUs that may be retired early and could be considered probable of abandonment in future periods, along with the net book value of such EGUs.

Non-regulated Operations - Factors considered in determining if an impairment review is necessary for long-lived assets within non-regulated operations include a significant underperformance of the assets relative to historical or projected future operating results, a significant change in the use of the acquired assets or business strategy related to such assets, and significant negative industry, regulatory or economic trends. When an impairment review is deemed necessary, a comparison is made between the expected undiscounted future cash flows and the carrying amount of the asset. If the carrying amount of the asset exceeds the expected undiscounted future cash flows, an impairment loss is recognized equal to the amount by which the carrying amount of the asset exceeds the fair value of the asset. The fair value is determined by the use of quoted market prices, appraisals, or the use of valuation techniques such as expected discounted future cash flows. Long-lived assets within non-regulated operations assessed for impairment indicators in 2016 included Alliant Energy’s Franklin County wind farm.

2014Franklin County Wind Farm included- Based on an evaluation of the strategic options for the Franklin County wind project forfarm performed in 2016, Alliant Energy and a wind site currently expected to be used to develop a future wind project for Alliant Energy and IPL.


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Franklin County Wind Project - Alliant Energy completed construction of its 99 MWconcluded it was probable the Franklin County wind project and placed it into service in 2012. In 2012,farm will be transferred to IPL. As a result, Alliant Energy performed an impairment testanalysis of such assets in 2016. Refer to Note 3 for discussion of the carrying valueimpairment analysis, which resulted in non-cash, pre-tax asset valuation charges of $86 million recorded by Alliant Energy in 2016. Going forward, the Franklin County wind project given a significant change in the use of the asset as a result of it being placed into service, continued downturn in forward electricity prices in 2012 and no long-term off-take arrangement. The test concluded the undiscounted cash flows expected from the Franklin County wind project during its estimated useful life exceeded its carrying value as of December 31, 2012, resulting in no impairment. On a quarterly basis, Alliant Energy evaluates for significant changes in the undiscounted cash flows used in the 2012 impairment test, which may indicate a significant decrease in the market value of the Franklin County wind project. No significant decrease in the undiscounted cash flows have been identified, and as a result, an impairment test has not been required since 2012. Future changes in the estimated cash flows could result in the undiscounted cash flows being less than the carrying amount and a future material impairment couldfarm will be required. Primary factors that could have an effect on the future expected cash flows for the project include the price of electricity generated from the project during its useful life, the volume of electricity generated, transmission constraints impacting the project, the expected life of the project, probability of selling the wind project, and changes in anticipated operation and maintenance expenses and capital expenditures, including replacement of key turbine components throughout the life of the project. The expected output of the project is, in part, based on transmission upgrades being completed in the next few years. The expected output of the project could be significantly lower if the transmission upgrades are not completed or if the level of congestion reduction is lower than expected. An impairment of the Franklin County wind project could be triggered in the future if long-term electricity prices stay at current levels or decline, or if the expected output or life of the project is significantly reduced. As of December 31, 2014, the carrying value of the Franklin County wind project was $137 million and was recorded in “Property, plant and equipment, net” on Alliant Energy’s balance sheet. Note 3 provides additional discussion of the Franklin County wind project.

Undeveloped Wind Site - As of December 31, 2014, Alliant Energy and IPL have an undeveloped wind site with capitalized costs of $13 million related to IPL’s wind site capacity in Franklin County, Iowa of up to 400 MW. Alliant Energy and IPL assessed the recoverability of this undeveloped wind site given the long-term period projected until the site is expected to be utilized and concluded no impairment test was required in 2014. Changes in the future use of this undeveloped wind site could result in a future impairment. The future utilization of this undeveloped wind site is dependent on the future demand of wind energy in the region where the wind site is located. Such future wind energy demand is dependent on various factors including future government incentives for wind projects, energy policy and legislation including federal and state renewable energy standards and regulation of carbon emissions, electricity and fossil fuel prices, transmission constraints in the region where the wind site is located and further technological advancements for wind generation. Alliant Energy and IPL currently believe, based on a combination of the various factors, further wind development in the region where the wind site is located will occur. Alliant Energy and IPL could realize an impairment related to this wind site if one or more of these factors are no longer expected to occur, or actions by regulatory agencies with jurisdiction over IPL indicate the costs of the undeveloped wind site would not be approved to be recovered from customers.

Regulated Operations - Long-lived assets within regulated operations are reviewed for possible impairment whenever events or changes in circumstances indicate all or a portion of the carrying value of the assets may be disallowed for rate-making purposes. If IPL or WPL is disallowed recovery of any portion of the carrying value of its regulated property, plant and equipment that has been recently completed or is probable of being retired early, an impairment charge is recognized equal to the amount of the carrying value that was disallowed recovery. If IPL or WPL is disallowed a full or partial return on the carrying value of its regulated property, plant and equipment that has been recently completed or is probable of being retired early, an impairment charge is recognized equal to the difference between the carrying amount of the asset and the present value of the future revenues expected from its regulated property, plant and equipment. Alliant Energy’s, IPL’s and WPL’s long-lived assets within their regulated operations that were assessed for impairment in 2014 included IPL’s and WPL’s generating units subject to early retirement.

Generating Units Subject to Early Retirement - Due to current and proposed environmental regulations, Alliant Energy, IPL and WPL are evaluating future plans for their electric generation fleet and have announced the early retirement of certain older and less-efficient EGUs. When it becomes probable that an EGU will be retired before the end of its useful life, Alliant Energy, IPL and WPL must assess whether the EGU meets the criteria to be considered probable of abandonment. EGUs that are considered probable of abandonment generally have material remaining net book values and are expected to cease operations in the near term significantly before the end of their original estimated useful lives. If an EGU meets such criteria to be considered probable of abandonment, Alliant Energy, IPL and WPL must assess the probability of full recovery of the remaining carrying value of such EGU. If it is probable that regulators will not allow full recovery of and a full return on the remaining carrying amount of the abandoned EGU, an impairment charge is recognized equal to the difference between the remaining carrying value and the present value of the future revenues expected from the abandoned EGU. Alliant Energy, IPL and WPL evaluated their EGUs that are subject to early retirement and determined that Edgewater Unit 3 and Nelson

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Dewey Units 1 and 2 met the criteria to be considered probable of abandonment as of December 31, 2014. Alliant Energy and WPL concluded that no impairment was required as of December 31, 2014 for Edgewater Unit 3 and Nelson Dewey Units 1 and 2 given that WPL is recovering the remaining net book value of these EGUs over a 10-year period beginning January 1, 2013 pursuant to a PSCW order issued in 2012. Refer to Note 3 for additional details of the EGUs considered probable of abandonment as of December 31, 2014. Refer to “Strategic Overview” for discussion of additional EGUs that may be considered probable of abandonment in future periods, along with the aggregate net book value of such EGUs.

Unbilled Revenues - Unbilled revenues are primarily associated with utility operations. Energy sales to individual customers are based on the reading of customers’ meters, which occurs on a systematic basis throughout the month. Amounts of energy delivered to customers since the date of the last meter reading are estimated at the end of each reporting period and the corresponding estimated unbilled revenue is recorded. The unbilled revenue estimate is based on daily system demand volumes, estimated customer usage by class, weathertemperature impacts, line losses and the most recent customer rates. Such process involves the use of various judgments and assumptions and significant changes in these judgments and assumptions could have a material impact on results of operations. As of December 31, 20142016, unbilled revenues related to Alliant Energy’s utility operations were $155$180 million ($7090 million at IPL and $85$90 million at WPL). Note 5(b) provides discussion of IPL’s unbilled revenues as of December 31, 20142016 sold to a third party related to its sales of accounts receivable program.

Pensions and Other Postretirement Benefits - Alliant Energy, IPL and WPL sponsor various defined benefit pension and OPEB plans that provide benefits to a significant portion of their employees.employees and retirees. Assumptions and judgments are made periodically to estimate the obligations and costs related to their retirement plans. There are many judgments and assumptions involved in determining an entity’s pension and other postretirement liabilities and costs each period including employee demographics (including age, life expectancies and compensation levels), discount rates, assumed rates of return and

funding. Changes made to plan provisions may also impact current and future benefits costs. Judgments and assumptions are supported by historical data and reasonable projections and are reviewed at least annually. The following table shows the impacts of changing certain key actuarial assumptions discussed above (in millions):
 Defined Benefit Pension Plans OPEB Plans Defined Benefit Pension Plans OPEB Plans
Change in Actuarial Assumption Impact on Projected Benefit Obligation at December 31, 2014 Impact on 2015 Net Periodic Benefit Costs Impact on Projected Benefit Obligation at December 31, 2014 Impact on 2015 Net Periodic Benefit Costs Impact on Projected Benefit Obligation at December 31, 2016 Impact on 2017 Net Periodic Benefit Costs Impact on Projected Benefit Obligation at December 31, 2016 Impact on 2017 Net Periodic Benefit Costs
Alliant Energy                
1% change in discount rate 
$176
 
$12
 
$23
 
$2
 
$162
 
$11
 
$21
 
$2
1% change in expected rate of return N/A
 10
 N/A
 1
 N/A
 9
 N/A
 1
IPL                
1% change in discount rate 81
 5
 9
 1
 75
 5
 8
 1
1% change in expected rate of return N/A
 5
 N/A
 1
 N/A
 4
 N/A
 1
WPL                
1% change in discount rate 78
 6
 9
 1
 71
 6
 8
 1
1% change in expected rate of return N/A
 4
 N/A
 
 N/A
 4
 N/A
 

Note 12(a) provides additional details of pension and OPEB plans.

Income Taxes - Alliant Energy, IPL and WPL are subject to income taxes in various jurisdictions. Assumptions and judgments are made each reporting period to estimate income tax assets, liabilities, benefits and expenses. Judgments and assumptions are supported by historical data and reasonable projections. Significant changes in these judgments and assumptions could have a material impact on financial condition and results of operations. Alliant Energy’s and IPL’s critical assumptions and judgments for 20142016 include estimates of qualifying deductions for repairs expenditures and allocation of mixed service costs due to the impact of Iowa rate-making principles on such property-related differences. Critical assumptions and judgments also include projections of future taxable income used to determine the ability to utilize net operating losses and credit carryforwards prior to their expiration and the states in which such future taxable income will be apportioned.expiration.


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Effect of Rate-making on Property-related Differences - Alliant Energy’s and IPL’s effective income tax rates are normally impacted by certain property-related differences at IPL for which deferred tax is not recorded in the income statement pursuant to Iowa rate-making principles. Changes in methods or assumptions regarding the amount of IPL’s qualifying repairs expenditures, allocation of mixed service costs, and costs related to retirement or removal of depreciable property could result in a material impact on Alliant Energy’s and IPL’s financial condition and results of operations. Refer to Note 1(c) for further discussion of regulatory accounting for taxes. Refer to Note 11 for details of how the effect of rate-making on property-related differences impacted Alliant Energy’s and IPL’s effective income tax rates for 2014, 20132016, 2015 and 2012.2014.

Carryforward Utilization - Significant federal tax credit carryforwards and federal and state net operating loss carryforwards have been generated. Based on projections of current and future taxable income, Alliant Energy, IPL and WPL plan to utilize substantially all of these carryforwards prior to their expiration. Changes in tax regulations or assumptions regarding current and future taxable income could require valuation allowances in the future resulting in a material impact on financial condition and results of operations. Refer to Note 11 for further discussion of federal tax credit carryforwards, and federal and state net operating loss carryforwards.

Other Future Considerations - In addition to items discussed earlier in MDA, the Notes in Item 8 and “Risk Factors” in Item 1A, the following items could impact future financial condition or results of operations:

Electric Transmission Service Expense - IPL and WPL currently receive substantially all their transmission services from ITC and ATC, respectively. Due to the use of formula rates used bythat allow ITC and ATC to change the amount they charge to their customers and possible futurebased upon changes to these rates as discussed below,the costs they incur, there is uncertainty regarding the long-term trends of IPL’s and WPL’s future electric transmission service expense. Alliant Energy, IPLBased on IPL’s and WPL currently anticipate changes to theirWPL’s electric transmission service expense in 2015 as follows:

Attachment “O” Rates - The annual transmission service rates that ITC or ATC charge their customers are calculated each calendar year using a FERC-approved cost of service formula rate referred to as Attachment “O.” Because Attachment “O” is a FERC-approved formula rate, ITC and ATC can implement new rates each calendar year without filing a request with FERC. However, new rates are subject to challenge by either FERC or customers. If the rates proposed by ITC or ATC are determined by FERC to be unjust or unreasonable or another mechanism is determined by FERC to be just and reasonable, ITC’s or ATC’s rates would change accordingly. In March 2014, FERC issued an order accepting revised protocols to MISO’s Attachment “O” protocols, which included changes to formalize the process for relevant parties to request information from transmission owners and file disputes related to formula rates, as well as establish timelines for such processes.

2015 Rates Charged by ITC to IPL - In September 2014, ITC filed with MISO the Attachment “O” rate it proposes to charge its customers in 2015 for electric transmission services. The proposed rate was based on ITC’s estimated net revenue requirement for 2015 as well as a true-up adjustment credit related to amounts that ITC over-recovered from its customers in 2013. The 2015 Attachment “O” rate filed with MISO is approximately 5% higher than the rate ITC charged its customers in 2014.

2015 Rates Charged by ATC to WPL - In September 2014, ATC shared with its customers the Attachment “O” rate it proposes to charge them in 2015 for electric transmission services. The proposed rate was based on ATC’s estimated net revenue requirement for 2015 as well as a true-up adjustment credit related to amounts that ATC over-recovered from its customers in 2013 and amounts that ATC estimated to be over-recovered in 2014. The 2015 Attachment “O” rate is approximately 3% higher than the rate ATC charged its customers in 2014.

Escrow Accounting at WPL- Electric revenues established in WPL’s retail electric rate case (2015/2016 Test Period) included recovery of expected increases in electric transmission service expense largely due to SSR costs expected to be incurred. Due to a recent revision in MISO’s method to allocate SSR costs, WPL no longer expects to incur such SSR costs. The difference between actual electric transmission service expense incurred and amounts collected from customers as electric revenues in 2015 and 2016 will be recorded as electric transmission service expense with an offsetting amount recorded to regulatory liabilities due to the escrow treatment WPL received as part of its approved retail electric rate case. Alliant and WPL currently expect an increase in electric transmission service expense in 2015 compared to 2014 as a result of WPL’s escrow treatment of electric transmission service expense.

2015 Electric Transmission Service Expense - Alliant Energy, IPL and WPL currently estimate their total electric transmission service expense in 2015 will be higher than the comparable expense in 2014 by approximately $45 million, $15 million and $30 million, respectively, as a result of the items discussed above.

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MISO Transmission Owner Return on Equity Complaint - In 2013, a group of MISO industrial customer organizations filed a complaint with FERC requesting to reduce the base return on equity used by MISO transmission owners, including ITC and ATC, to 9.15%, and institute a regulatory capital structure not to exceed 50% of common equity, among other items. ITC’s and ATC’s current authorized return on equity is 12.38% and 12.2%, respectively. ITC’s and ATC’s current authorized regulatory capital structure for common equity is 60% and 50%, respectively.

In October 2014, FERC issued an order on the complaint against the MISO transmission owners, established hearing and settlement procedures on the return on equity component of the complaint, and established a refund period back to November 12, 2013. FERC also denied the request to limit the regulatory capital structure to 50% of common equity, among other items. Settlement discussions between the parties were held and no agreement was reached. The complaint is now subject to hearing procedures and an initial decision from FERC on the complaint is currently expected in late 2015. Alliant Energy, IPL and WPL are currently unable to determine what, if any, impact the October 2014 FERC order, subsequent hearing procedures and a new methodology FERC established for determining the return on equity may have on the returns authorized by FERC for MISO transmission owners, including ITC and ATC.

Any change to ITC’s and ATC’s return on equity would impact the calculation of their respective Attachment “O” rates, resulting in changes to electric transmission service costs billed by ITC and ATC to their customers. Any changes in IPL’s electric transmission service costs billed by ITC to IPL are expected to be passed on to IPL’s Iowa retail electric customers through the transmission cost recovery rider. Any changesmechanisms discussed in WPL’s electric transmission service costs will be incorporated into WPL’s retail electric rates in a future retail electric base rate proceeding with the PSCW. Pursuant to the July 2014 PSCW order related to WPL’s Wisconsin retail electric and gas rate case (2015/2016 Test Period)Note 1(g), WPL received escrow treatment for the difference between actual electric transmission service costs and those costs used to determine rates during 2015 and 2016. Based on these transmission cost recovery mechanisms, IPL and WPL currently do not expect that any changes to electric transmission service costs billed by ITC and ATC due to this complaint will have a material impact on their financial condition and results of operations.

In addition, any change2017 Electric Transmission Service Expense - Alliant Energy and IPL currently estimate their total electric transmission service expense in 2017 will be lower than the comparable expense in 2016 by approximately $45 million, primarily due to ATC’san expected lower return on equity could resultfor ITC in Alliant Energy2017 and WPL realizing lower equity income and dividendsrefunds anticipated to be received in 2017 from ATC inITC resulting from the future. Alliant Energy and WPL currently estimate each 25 basis point reduction in ATC’s authorizedMISO transmission owner return on equity would reduce their annual pre-taxcomplaints discussed below, partially offset by increased rate base at ITC. WPL’s total electric transmission service expense in 2017 is expected to be consistent with 2016 due to the escrow

accounting treatment for its electric transmission service expense, as well as cost estimates included in WPL’s approved retail electric rate case (2017/2018 Test Period), which exclude the impacts of an expected lower return on equity incomein 2017 and associated refunds resulting from the MISO transmission owner return on equity complaints.

MISO Transmission Owner Return on Equity Complaints - A group of MISO cooperative and municipal utilities previously filed two complaints with FERC requesting a reduction to the base return on equity used by MISO transmission owners, including ITC and ATC. In September 2016, FERC issued an order on the first complaint and established a base return on equity of 10.32%, excluding any incentive adders granted by FERC, effective September 28, 2016, and for the refund period from November 12, 2013 through February 11, 2015. In October 2016, in response to MISO’s and the MISO transmission owners’ request, FERC ordered the related refunds to be issued no later than July 2017. IPL anticipates the retail portion of the refund from ITC will be refunded to its customers in 2017 through the transmission cost rider, pending IUB approval. WPL will defer the refund from ATC by approximately $1 million.to a regulatory liability and refunds to its retail customers are expected to be addressed in a future rate proceeding. WPL’s and IPL’s wholesale customers will receive their share of the refunds through normal monthly billing practices as the refunds are received. Alliant Energy, IPL and WPL are currently unableexpect to determinereceive refunds of $51 million, $40 million and $11 million, respectively, in the timing and naturefirst quarter of any subsequent FERC action related2017, subject to these matters and resulting changes to their financial condition and resultsfinal true-up by the end of operations.July 2017.

In June 2016, a FERC administrative law judge issued an initial decision regarding the second complaint and recommended a base return on equity of 9.70%, excluding any incentive adders granted by FERC, for the refund period from February 12, 2015 through May 11, 2016. A final decision from FERC on the second complaint is currently expected in the first half of 2017.

The total return on equity for ITC and ATC includes a base return on equity, as determined by FERC pursuant to the two MISO Transmission Owners’ Request for Equity Adder -complaints, and incentive adders to the return on equity requested by the transmission owners and granted by FERC. In January 2015, FERC issued an order accepting a request from a groupgranting incentive adders of MISO transmission owners, including0.50% to both ITC and ATC to implement a 50 basis pointbased on their participation in MISO effective January 6, 2015. In March 2015, FERC issued an order granting an additional incentive adder of 0.50% to their return on equity based on participation in MISO. The implementation of the adder is effective January 2015, subject to certain conditions. Alliant Energy, IPL and WPL are currently unable to determine any resulting changes to future electric transmission service charges pending a decision by FERC regarding the MISO transmission owner return on equity complaint discussed above.

ITC Request for Equity Adder - In January 2015, ITC requested approval from FERC to implement a 100 basis point incentive adder to their return on equity for being an independent transmission company. The implementation of the adder was requested to becompany effective April 1, 2015, subject to certain conditions.2015.

As a result of the two MISO complaints, Alliant Energy and IPL are currently unable to determine the exact timing and natureWPL have realized a cumulative $24 million of any subsequent FERC action related to this matter or any resulting changes to future electric transmission service charges.

ITC’s Attachment “FF” Tariff - In 2012, IPL filed a complaint with FERC regarding ITC’s Attachment “FF” tariff. ITC’s Attachment “FF” tariff determines how much of the transmission network upgrade costs incurred to interconnect an EGU to ITC’s transmission system will be incurred by the owner of such EGU. In the complaint, IPL alleged that its customers have made material incremental payments under ITC’s Attachment “FF” tariff without obtaining equal benefits, as compared to costs that would have been charged under MISO’s Attachment “FF” tariff applicablereductions in the majority of the MISO pricing zones. In July 2013, FERC issued an order requiring MISO, on behalf of ITC, to revise ITC’s Attachment “FF” tariff to conform to the MISO Attachment “FF” tariff. In August 2013, MISO submitted a filing with these tariff revisions, which became effective as of the date of the July 2013 order. Also in August 2013, ITC filed a request for rehearing and/or clarification, and IPL filed a request for clarification. In February 2014, FERC issued an order that denied ITC’s request for rehearing, responded to the requests for clarification, accepted MISO’s tariff revisions and substantially affirmed its July 2013 order. In March 2014, another utility filed a request for rehearing with FERC on the February 2014 order. It is uncertain how or when future FERC action, if any, could change the results of the February 2014 order or the future amount

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of electric transmission service charges billed by ITC to IPL and WPL. The revised Attachment “FF” tariff is expected to reduce the amount of transmission network upgrade costs billed by ITC to IPL compared to what would have been billed under ITC’s prior Attachment “FF” tariff. Alliant Energy and IPL currently expect to pass on the Iowa retail portion of any changes in electric transmission service costs billed by ITC to IPLequity income from the revision in ITC’s Attachment “FF” tariff to IPL’s retail electric customers in IowaATC through the transmission cost recovery rider.December 31, 2016.

Sales Trends -
Jo-Carroll Energy, Inc. - In March 2014, Jo-Carroll Energy, Inc. provided notice of termination of its wholesale power supply agreement with IPL effective April 1, 2018. Sales to Jo-Carroll Energy, Inc. represented 3% of IPL’s total electric sales in 2014.2016.

WPPI Energy - In November 2014, WPPI Energy provided notice of termination of its wholesale power supply agreement with WPL effective May 31, 2017. Sales to WPPI Energy represented 8%5% of WPL’s total electric sales in 2014.2016.

Great Lakes Utilities - In October 2014, Great Lakes Utilities provided notice of termination of its wholesale power supply agreement with WPL effective December 31, 2017. Sales to Great Lakes Utilities represented approximately 2% of WPL’s total electric sales in 2014.2016.

Retirement Plan Costs - Alliant Energy’s, IPL’s and WPL’s net periodic benefit costs related to their defined benefit pension and OPEB plans are currently expected to be higher in 2015 compared to 2014 by approximately $21 million, $11 million and $10 million, respectively. The increase in net periodic benefit costs is primarily due to the use of lower discount rates and a change in life expectancy assumptions as of December 31, 2014. Approximately 30% to 40% of net periodic benefit costs are allocated to capital projects each year. As a result, the increase in net periodic benefit costs is not expected to result in a comparable increase in other operation and maintenance expenses. Refer to Note 12(a) for additional details of defined benefit pension and OPEB plans.

Performance-based Compensation Plans - Alliant Energy’s total compensation package includes a performance-based compensation program, which provides substantially all of its non-bargaining employees an opportunity to receive annual cash payments based on the achievement of specific short-term annual operational and financial performance measures. In addition, the total compensation program for certain key employees includes long-term awards issued under equity-based compensation plans. In 2014, Alliant Energy, IPL and WPL incurred $42 million, $24 million and $17 million, respectively, of performance-based compensation expense. Refer to Note 12(b) for details of the equity-based compensation plans. Alliant Energy, IPL and WPL are currently unable to determine what impacts these performance-based compensation plans will have on their future financial condition or results of operations.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Quantitative and Qualitative Disclosures About Market Risk are reported in “Other Matters - Market Risk Sensitive Instruments and Positions” in MDA.


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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of Alliant Energy Corporation and subsidiaries (Alliant Energy) is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. Alliant Energy’s internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America.

Because of the inherent limitations of internal control over financial reporting, misstatements may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Alliant Energy’s management assessed the effectiveness of Alliant Energy’s internal control over financial reporting as of December 31, 2014 using the criteria set forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, Alliant Energy’s management concluded that, as of December 31, 2014, Alliant Energy’s internal control over financial reporting was effective.

Deloitte & Touche LLP, Alliant Energy’s independent registered public accounting firm, has audited Alliant Energy’s internal control over financial reporting. That report is set forth immediately prior to the report of Deloitte & Touche LLP on the financial statements included herein.


/s/ Patricia L. Kampling
Patricia L. Kampling
Chairman, President and Chief Executive Officer


/s/ Thomas L. Hanson
Thomas L. Hanson
Senior Vice President and Chief Financial Officer


/s/ Robert J. Durian
Robert J. Durian
Controller and Chief Accounting Officer


February 24, 2015


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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors and Shareowners of
Alliant Energy Corporation
Madison, Wisconsin

We have audited the internal control over financial reporting of Alliant Energy Corporation and subsidiaries (the “Company”) as of December 31, 2014, based on thecriteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2014, based on the criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements and financial statement schedules as of and for the year ended December 31, 2014 of the Company and our report dated February 24, 2015 expressed an unqualified opinion on those financial statements and financial statement schedules.


/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

Milwaukee, Wisconsin
February 24, 2015

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors and Shareowners of
Alliant Energy Corporation
Madison, Wisconsin

We have audited the accompanying consolidated balance sheets of Alliant Energy Corporation and subsidiaries (the “Company”) as of December 31, 20142016 and 2013,2015, and the related consolidated statements of income, common equity, and cash flows for each of the three years in the period ended December 31, 2014.2016. Our audits also included the Company’s financial statement schedules listed in the Index at Item 15. These financial statements and financial statement schedules are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 20142016 and 2013,2015, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2014,2016, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2014,2016, based on the criteria established in Internal Control-Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 24, 20152017 expressed an unqualified opinion on the Company’s internal control over financial reporting.


/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

Milwaukee, Wisconsin
February 24, 20152017


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ALLIANT ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF INCOME
Year Ended December 31,Year Ended December 31,
2014 2013 20122016 2015 2014
(in millions, except per share amounts)(in millions, except per share amounts)
Operating revenues:          
Utility:     
Electric
$2,713.6
 
$2,689.0
 
$2,589.3
Gas517.5
 464.8
 396.3
Other66.1
 71.3
 56.7
Electric utility
$2,875.5
 
$2,770.5
 
$2,713.6
Gas utility355.4
 381.2
 517.5
Other utility48.6
 57.9
 66.1
Non-regulated53.1
 51.7
 52.2
40.5
 44.0
 53.1
Total operating revenues3,350.3
 3,276.8
 3,094.5
3,320.0
 3,253.6
 3,350.3
Operating expenses:          
Utility:     
Electric production fuel and energy purchases852.1
 725.0
 712.3
Purchased electric capacity25.1
 216.8
 271.5
Electric production fuel and purchased power854.0
 837.7
 877.2
Electric transmission service447.5
 418.3
 341.3
527.9
 485.3
 447.5
Cost of gas sold327.8
 276.7
 217.2
194.3
 219.1
 327.8
Asset valuation charges for Franklin County wind farm86.4
 
 
Other operation and maintenance658.3
 620.7
 590.0
606.5
 629.5
 665.0
Non-regulated operation and maintenance6.7
 14.9
 11.9
Depreciation and amortization388.1
 370.9
 332.4
411.6
 401.3
 388.1
Taxes other than income taxes101.1
 99.6
 98.2
102.3
 103.7
 101.1
Total operating expenses2,806.7
 2,742.9
 2,574.8
2,783.0
 2,676.6
 2,806.7
Operating income543.6
 533.9
 519.7
537.0
 577.0
 543.6
Interest expense and other:          
Interest expense180.6
 172.8
 156.7
196.2
 187.1
 180.6
Equity income from unconsolidated investments, net(40.4) (43.7) (41.3)(39.6) (33.8) (40.4)
Allowance for funds used during construction(34.8) (30.8) (21.9)(62.5) (36.9) (34.8)
Interest income and other(1.8) (0.4) (4.0)(0.5) (0.7) (1.8)
Total interest expense and other103.6
 97.9
 89.5
93.6
 115.7
 103.6
Income from continuing operations before income taxes440.0
 436.0
 430.2
443.4
 461.3
 440.0
Income taxes44.3
 53.9
 89.4
59.4
 70.4
 44.3
Income from continuing operations, net of tax395.7
 382.1
 340.8
384.0
 390.9
 395.7
Loss from discontinued operations, net of tax(2.4) (5.9) (5.1)(2.3) (2.5) (2.4)
Net income393.3
 376.2
 335.7
381.7
 388.4
 393.3
Preferred dividend requirements of subsidiaries10.2
 17.9
 15.9
Preferred dividend requirements of Interstate Power and Light Company10.2
 10.2
 10.2
Net income attributable to Alliant Energy common shareowners
$383.1
 
$358.3
 
$319.8

$371.5
 
$378.2
 
$383.1
Weighted average number of common shares outstanding (basic and diluted)110.8
 110.8
 110.8
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted):     
Weighted average number of common shares outstanding (basic and diluted) (a)227.1
 225.4
 221.7
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted) (a):     
Income from continuing operations, net of tax
$3.48
 
$3.29
 
$2.93

$1.65
 
$1.69
 
$1.74
Loss from discontinued operations, net of tax(0.02) (0.06) (0.04)(0.01) (0.01) (0.01)
Net income
$3.46
 
$3.23
 
$2.89

$1.64
 
$1.68
 
$1.73
Amounts attributable to Alliant Energy common shareowners:          
Income from continuing operations, net of tax
$385.5
 
$364.2
 
$324.9

$373.8
 
$380.7
 
$385.5
Loss from discontinued operations, net of tax(2.4) (5.9) (5.1)(2.3) (2.5) (2.4)
Net income attributable to Alliant Energy common shareowners
$383.1
 
$358.3
 
$319.8
Net income
$371.5
 
$378.2
 
$383.1

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

86

Table of Contents


ALLIANT ENERGY CORPORATION
CONSOLIDATED BALANCE SHEETS
 December 31,
 2014 2013
 (in millions)
ASSETS   
Current assets:   
Cash and cash equivalents
$56.9
 
$9.8
Accounts receivable, less allowance for doubtful accounts427.3
 473.3
Production fuel, at weighted average cost83.8
 103.6
Materials and supplies, at weighted average cost72.9
 69.6
Gas stored underground, at weighted average cost67.1
 38.6
Regulatory assets68.1
 53.9
Deferred income tax assets150.1
 136.7
Other116.9
 125.7
Total current assets1,043.1
 1,011.2
Property, plant and equipment, net8,938.4
 8,326.5
Investments:   
Investment in American Transmission Company LLC286.5
 272.1
Other58.4
 57.5
Total investments344.9
 329.6
Other assets:   
Regulatory assets1,715.6
 1,359.3
Deferred charges and other43.9
 85.8
Total other assets1,759.5
 1,445.1
Total assets
$12,085.9
 
$11,112.4

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

87

Table of Contents


ALLIANT ENERGY CORPORATION
CONSOLIDATED BALANCE SHEETS (Continued)
 December 31,
 2014 2013
 
(in millions, except per
share and share amounts)
LIABILITIES AND EQUITY   
Current liabilities:   
Current maturities of long-term debt
$183.0
 
$358.5
Commercial paper141.3
 279.4
Accounts payable427.9
 365.0
Regulatory liabilities200.1
 196.6
Other262.4
 233.8
Total current liabilities1,214.7
 1,433.3
Long-term debt, net (excluding current portion)3,606.7
 2,977.8
Other liabilities:   
Deferred income tax liabilities2,321.1
 2,112.7
Regulatory liabilities621.1
 624.9
Pension and other benefit obligations421.7
 206.6
Other260.1
 273.9
Total other liabilities3,624.0
 3,218.1
Commitments and contingencies (Note 16)

 
Equity:   
Alliant Energy Corporation common equity:   
Common stock - $0.01 par value - 240,000,000 shares authorized; 110,935,680 and 110,943,669 shares outstanding1.1
 1.1
Additional paid-in capital1,509.1
 1,507.8
Retained earnings1,938.0
 1,780.7
Accumulated other comprehensive loss(0.6) (0.2)
Shares in deferred compensation trust - 238,935 and 227,469 shares at a weighted average cost of $37.45 and $35.25 per share(8.9) (8.0)
Total Alliant Energy Corporation common equity3,438.7
 3,281.4
Cumulative preferred stock of Interstate Power and Light Company200.0
 200.0
Noncontrolling interest1.8
 1.8
Total equity3,640.5
 3,483.2
Total liabilities and equity
$12,085.9
 
$11,112.4
(a)
Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.


88



ALLIANT ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWSBALANCE SHEETS
 Year Ended December 31,
 2014 2013 2012
 (in millions)
Cash flows from operating activities:     
Net income
$393.3
 
$376.2
 
$335.7
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization388.1
 370.9
 332.9
Other amortizations54.2
 40.2
 55.0
Deferred taxes and investment tax credits55.2
 108.3
 143.3
Equity income from unconsolidated investments, net(40.4) (43.7) (41.3)
Distributions from equity method investments36.4
 35.4
 34.2
Equity component of allowance for funds used during construction(23.1) (20.3) (14.1)
Other2.0
 (3.7) 0.7
Other changes in assets and liabilities:     
Accounts receivable48.7
 (49.2) 61.3
Sales of accounts receivable(7.0) (101.0) (10.0)
Regulatory assets(439.8) 140.5
 (178.1)
Regulatory liabilities10.8
 (90.8) 16.4
Deferred income taxes138.4
 101.9
 69.7
Pension and other benefit obligations215.1
 (157.4) 51.3
Other59.7
 23.7
 (15.9)
Net cash flows from operating activities891.6
 731.0
 841.1
Cash flows used for investing activities:     
Construction and acquisition expenditures:     
Utility business - purchase of Riverside Energy Center
 
 (403.5)
Utility business - other(838.9) (731.6) (622.0)
Alliant Energy Corporate Services, Inc. and non-regulated businesses(63.9) (66.7) (132.6)
Proceeds from Franklin County wind project cash grant
 62.4
 
Other(14.9) (18.8) 2.6
Net cash flows used for investing activities(917.7) (754.7) (1,155.5)
Cash flows from financing activities:     
Common stock dividends(225.8) (208.3) (199.3)
Preferred dividends paid by subsidiaries(10.2) (11.4) (15.9)
Payments to redeem cumulative preferred stock of IPL and WPL
 (211.0) 
Proceeds from issuance of cumulative preferred stock of IPL
 200.0
 
Proceeds from issuance of long-term debt812.9
 250.0
 385.0
Payments to retire long-term debt(358.5) (1.5) (1.4)
Net change in commercial paper(138.1) 11.9
 164.7
Other(7.1) (17.4) (8.9)
Net cash flows from financing activities73.2
 12.3
 324.2
Net increase (decrease) in cash and cash equivalents47.1
 (11.4) 9.8
Cash and cash equivalents at beginning of period9.8
 21.2
 11.4
Cash and cash equivalents at end of period
$56.9
 
$9.8
 
$21.2
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest, net of capitalized interest
($180.8) 
($171.7) 
($155.2)
Income taxes, net
$5.3
 
$9.6
 
$20.3
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$160.3
 
$103.8
 
$105.3
The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

89



ALLIANT ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF COMMON EQUITY
 December 31,
 2016 2015
 
(in millions, except per
share and share amounts)
ASSETS   
Current assets:   
Cash and cash equivalents
$8.2
 
$5.8
Accounts receivable, less allowance for doubtful accounts493.3
 397.6
Production fuel, at weighted average cost98.1
 98.8
Gas stored underground, at weighted average cost37.6
 43.3
Materials and supplies, at weighted average cost86.6
 81.4
Regulatory assets57.8
 120.2
Other95.5
 79.7
Total current assets877.1
 826.8
Property, plant and equipment, net10,279.2
 9,519.1
Investments:   
Investment in American Transmission Company LLC317.6
 293.3
Other20.0
 53.0
Total investments337.6
 346.3
Other assets:   
Regulatory assets1,857.3
 1,788.4
Deferred charges and other22.6
 14.6
Total other assets1,879.9
 1,803.0
Total assets
$13,373.8
 
$12,495.2
           Total
       Accumulated Shares in Alliant
   Additional   Other Deferred Energy
 Common Paid-In Retained Comprehensive Compensation Common
 Stock Capital Earnings Income (Loss) Trust Equity
 (in millions)
2012:           
Beginning balance$1.1 
$1,510.8
 
$1,510.2
 
($0.8) 
($8.3) 
$3,013.0
Net income attributable to Alliant Energy common shareowners    319.8
     319.8
Common stock dividends ($1.80 per share)    (199.3)     (199.3)
Other  0.4
     1.0
 1.4
Ending balance1.1 1,511.2
 1,630.7
 (0.8) (7.3) 3,134.9
2013:           
Net income attributable to Alliant Energy common shareowners    358.3
     358.3
Common stock dividends ($1.88 per share)    (208.3)     (208.3)
Preferred stock issuance costs  (5.4)       (5.4)
Other  2.0
     (0.7) 1.3
Other comprehensive income, net of tax      0.6
   0.6
Ending balance1.1
 1,507.8
 1,780.7
 (0.2) (8.0) 3,281.4
2014:           
Net income attributable to Alliant Energy common shareowners    383.1
     383.1
Common stock dividends ($2.04 per share)    (225.8)     (225.8)
Other  1.3
     (0.9) 0.4
Other comprehensive loss, net of tax      (0.4)   (0.4)
Ending balance
$1.1
 
$1,509.1
 
$1,938.0
 
($0.6) 
($8.9) 
$3,438.7
LIABILITIES AND EQUITY   
Current liabilities:   
Current maturities of long-term debt
$4.6
 
$313.4
Commercial paper244.1
 159.8
Accounts payable445.3
 402.4
Regulatory liabilities186.2
 187.1
Accrued taxes59.5
 53.2
Other222.3
 243.4
Total current liabilities1,162.0
 1,359.3
Long-term debt, net (excluding current portion)4,315.6
 3,522.2
Other liabilities:   
Deferred tax liabilities2,570.2
 2,381.2
Regulatory liabilities494.8
 550.6
Pension and other benefit obligations489.9
 451.8
Other279.3
 306.0
Total other liabilities3,834.2
 3,689.6
Commitments and contingencies (Note 16)

 
Equity:   
Alliant Energy Corporation common equity:   
Common stock - $0.01 par value - 480,000,000 shares authorized; 227,673,654 and 226,918,432 shares outstanding (a)2.3
 2.3
Additional paid-in capital (a)1,693.1
 1,661.8
Retained earnings2,177.0
 2,068.9
Accumulated other comprehensive loss(0.4) (0.4)
Shares in deferred compensation trust - 441,695 and 430,186 shares at a weighted average cost of $22.71 and $19.84 per share (a)(10.0) (8.5)
Total Alliant Energy Corporation common equity3,862.0
 3,724.1
Cumulative preferred stock of Interstate Power and Light Company200.0
 200.0
Total equity4,062.0
 3,924.1
Total liabilities and equity
$13,373.8
 
$12,495.2
(a)
Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

ALLIANT ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS
90

 Year Ended December 31,
 2016 2015 2014
 (in millions)
Cash flows from operating activities:     
Net income
$381.7
 
$388.4
 
$393.3
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization411.6
 401.3
 388.1
Other amortizations(4.8) 12.4
 54.2
Deferred tax expense and tax credits84.6
 114.2
 55.2
Equity income from unconsolidated investments, net(39.6) (33.8) (40.4)
Distributions from equity method investments28.3
 30.6
 36.4
Equity component of allowance for funds used during construction(42.3) (24.4) (23.1)
Asset valuation charges for Franklin County wind farm86.4
 
 
Other0.8
 15.7
 2.0
Other changes in assets and liabilities:     
Accounts receivable(121.4) 36.8
 48.7
Sales of accounts receivable16.0
 (17.0) (7.0)
Regulatory assets(3.6) (104.5) (439.8)
Regulatory liabilities(63.0) (67.8) 10.8
Deferred income taxes102.4
 94.6
 138.4
Pension and other benefit obligations38.1
 30.1
 215.1
Other(15.6) (5.4) 59.7
Net cash flows from operating activities859.6
 871.2
 891.6
Cash flows used for investing activities:     
Construction and acquisition expenditures:     
Utility business(1,142.7) (963.6) (838.9)
Alliant Energy Corporate Services, Inc. and non-regulated businesses(54.1) (70.7) (63.9)
Proceeds from Minnesota electric and natural gas distribution asset sales
 139.9
 
Other10.3
 (24.8) (14.9)
Net cash flows used for investing activities(1,186.5) (919.2) (917.7)
Cash flows from (used for) financing activities:     
Common stock dividends(266.5) (247.3) (225.8)
Proceeds from issuance of common stock, net26.6
 151.2
 
Proceeds from issuance of long-term debt800.0
 250.7
 812.9
Payments to retire long-term debt(313.4) (183.0) (358.5)
Net change in commercial paper84.3
 18.5
 (138.1)
Other(1.7) 6.8
 (17.3)
Net cash flows from (used for) financing activities329.3
 (3.1) 73.2
Net increase (decrease) in cash and cash equivalents2.4
 (51.1) 47.1
Cash and cash equivalents at beginning of period5.8
 56.9
 9.8
Cash and cash equivalents at end of period
$8.2
 
$5.8
 
$56.9
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest, net of capitalized interest
($192.4) 
($184.8) 
($180.8)
Income taxes, net
($9.8) 
$—
 
$5.3
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$154.4
 
$148.3
 
$160.3
TableThe accompanying Combined Notes to Consolidated Financial Statements are an integral part of Contentsthese statements.

ALLIANT ENERGY CORPORATION

CONSOLIDATED STATEMENTS OF COMMON EQUITY
           Total
       Accumulated Shares in Alliant
   Additional   Other Deferred Energy
 Common Paid-In Retained Comprehensive Compensation Common
 Stock Capital Earnings Income (Loss) Trust Equity
 (in millions)
2014:           
Beginning balance (a)
$2.2
 
$1,506.7
 
$1,780.7
 
($0.2) 
($8.0) 
$3,281.4
Net income attributable to Alliant Energy common shareowners    383.1
     383.1
Common stock dividends ($1.02 per share) (a)    (225.8)     (225.8)
Other  1.3
     (0.9) 0.4
Other comprehensive loss, net of tax      (0.4)   (0.4)
Ending balance (a)2.2
 1,508.0
 1,938.0
 (0.6) (8.9) 3,438.7
2015:           
Net income attributable to Alliant Energy common shareowners    378.2
     378.2
Common stock dividends ($1.10 per share) (a)    (247.3)     (247.3)
Common stock issued, net (a)0.1
 151.1
       151.2
Other  2.7
     0.4
 3.1
Other comprehensive income, net of tax      0.2
   0.2
Ending balance (a)2.3
 1,661.8
 2,068.9
 (0.4) (8.5) 3,724.1
2016:           
Net income attributable to Alliant Energy common shareowners    371.5
     371.5
Common stock dividends ($1.175 per share) (a)    (266.5)     (266.5)
Common stock issued, net  26.6
       26.6
Other  4.7
 3.1
   (1.5) 6.3
Ending balance
$2.3
 
$1,693.1
 
$2,177.0
 
($0.4) 
($10.0) 
$3,862.0

MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
(a)
Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.

The managementaccompanying Combined Notes to Consolidated Financial Statements are an integral part of Interstate Power and Light Company and subsidiary (IPL) is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. IPL’s internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America.these statements.

Because of the inherent limitations of internal control over financial reporting, misstatements may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

IPL’s management assessed the effectiveness of IPL’s internal control over financial reporting as of December 31, 2014 using the criteria set forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, IPL’s management concluded that, as of December 31, 2014, IPL’s internal control over financial reporting was effective.


/s/ Patricia L. Kampling
Patricia L. Kampling
Chairman and Chief Executive Officer


/s/ Thomas L. Hanson
Thomas L. Hanson
Senior Vice President and Chief Financial Officer


/s/ Robert J. Durian
Robert J. Durian
Controller and Chief Accounting Officer


February 24, 2015


91



REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors and Shareowners of
Interstate Power and Light Company
Cedar Rapids, Iowa

We have audited the accompanying consolidated balance sheets of Interstate Power and Light Company and subsidiary (the “Company”) as of December 31, 20142016 and 2013,2015, and the related consolidated statements of income, common equity, and cash flows for each of the three years in the period ended December 31, 2014.2016. Our audits also included the Company’s financial statement schedule listed in the Index at Item 15. These financial statements and the financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and the financial statement schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 20142016 and 2013,2015, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2014,2016, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, the financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

Milwaukee, Wisconsin
February 24, 20152017


92



INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF INCOME
Year Ended December 31,Year Ended December 31,
2014 2013 20122016 2015 2014
(in millions)(in millions)
Operating revenues:          
Electric utility
$1,493.3
 
$1,491.8
 
$1,371.1

$1,569.7
 
$1,503.8
 
$1,493.3
Gas utility296.5
 273.9
 226.7
204.0
 217.3
 296.5
Steam and other58.3
 53.1
 52.5
46.7
 53.4
 58.3
Total operating revenues1,848.1
 1,818.8
 1,650.3
1,820.4
 1,774.5
 1,848.1
Operating expenses:          
Electric production fuel and energy purchases472.3
 382.1
 344.5
Purchased electric capacity25.0
 155.2
 153.7
Electric production fuel and purchased power430.5
 428.4
 497.3
Electric transmission service323.4
 301.4
 235.0
359.7
 328.2
 323.4
Cost of gas sold185.5
 160.3
 124.9
111.0
 123.3
 185.5
Other operation and maintenance381.1
 362.3
 350.0
383.7
 389.9
 381.1
Depreciation and amortization197.5
 191.1
 188.9
210.8
 207.2
 197.5
Taxes other than income taxes54.1
 54.4
 53.0
53.9
 55.6
 54.1
Total operating expenses1,638.9
 1,606.8
 1,450.0
1,549.6
 1,532.6
 1,638.9
Operating income209.2
 212.0
 200.3
270.8
 241.9
 209.2
Interest expense and other:          
Interest expense89.9
 81.3
 78.5
103.2
 96.8
 89.9
Allowance for funds used during construction(25.9) (21.0) (8.4)(52.0) (28.2) (25.9)
Interest income and other2.3
 (0.3) (0.2)(0.3) (0.2) 2.3
Total interest expense and other66.3
 60.0
 69.9
50.9
 68.4
 66.3
Income before income taxes142.9
 152.0
 130.4
219.9
 173.5
 142.9
Income tax benefit(51.7) (37.9) (19.8)(5.9) (22.7) (48.9)
Net income194.6
 189.9
 150.2
225.8
 196.2
 191.8
Preferred dividend requirements10.2
 16.3
 12.6
10.2
 10.2
 10.2
Earnings available for common stock
$184.4
 
$173.6
 
$137.6

$215.6
 
$186.0
 
$181.6
Earnings per share data is not disclosed given Alliant Energy Corporation is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented.
The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

93



INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED BALANCE SHEETS
December 31,December 31,
2014 20132016 2015
(in millions)
(in millions, except per
share and share amounts)
ASSETS      
Current assets:      
Cash and cash equivalents
$5.3
 
$4.4

$3.3
 
$4.5
Accounts receivable, less allowance for doubtful accounts216.7
 246.9
240.7
 200.0
Production fuel, at weighted average cost52.7
 75.6
70.3
 60.2
Gas stored underground, at weighted average cost16.3
 18.2
Materials and supplies, at weighted average cost42.0
 39.4
46.5
 45.7
Gas stored underground, at weighted average cost30.8
 18.9
Regulatory assets38.7
 28.5
17.7
 39.6
Deferred income tax assets104.9
 87.7
Other65.0
 34.5
27.7
 28.2
Total current assets556.1
 535.9
422.5
 396.4
Property, plant and equipment, net4,554.7
 4,136.8
5,435.6
 4,925.1
Investments19.1
 18.6
0.8
 19.6
Other assets:      
Regulatory assets1,319.2
 1,085.0
1,441.1
 1,363.0
Deferred charges and other12.7
 29.7
4.7
 5.0
Total other assets1,331.9
 1,114.7
1,445.8
 1,368.0
Total assets
$6,461.8
 
$5,806.0

$7,304.7
 
$6,709.1

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED BALANCE SHEETS (Continued)
December 31,
2014 2013
(in millions, except per
share and share amounts)
LIABILITIES AND EQUITY      
Current liabilities:      
Current maturities of long-term debt
$150.0
 
$38.4
Accounts payable259.6
 187.1

$186.3
 
$197.2
Accounts payable to associated companies31.3
 29.1
43.3
 37.7
Regulatory liabilities129.7
 143.8
149.6
 130.9
Accrued taxes45.3
 51.1
53.8
 67.6
Accrued interest31.6
 28.2
Other90.0
 74.8
57.2
 69.5
Total current liabilities705.9
 524.3
521.8
 531.1
Long-term debt, net (excluding current portion)1,618.7
 1,520.0
Long-term debt, net2,153.5
 1,856.9
Other liabilities:      
Deferred income tax liabilities1,341.4
 1,193.0
Deferred tax liabilities1,511.8
 1,378.0
Regulatory liabilities453.8
 471.1
281.2
 358.3
Pension and other benefit obligations142.4
 48.6
173.2
 160.2
Other185.5
 169.3
214.2
 229.3
Total other liabilities2,123.1
 1,882.0
2,180.4
 2,125.8
Commitments and contingencies (Note 16)

 

 
Equity:      
Interstate Power and Light Company common equity:      
Common stock - $2.50 par value - 24,000,000 shares authorized; 13,370,788 shares outstanding33.4
 33.4
33.4
 33.4
Additional paid-in capital1,242.8
 1,152.8
1,597.8
 1,407.8
Retained earnings537.9
 493.5
617.8
 554.1
Total Interstate Power and Light Company common equity1,814.1
 1,679.7
2,249.0
 1,995.3
Cumulative preferred stock200.0
 200.0
200.0
 200.0
Total equity2,014.1
 1,879.7
2,449.0
 2,195.3
Total liabilities and equity
$6,461.8
 
$5,806.0

$7,304.7
 
$6,709.1

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.


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INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
 Year Ended December 31,
 2014 2013 2012
 (in millions)
Cash flows from operating activities:     
Net income
$194.6
 
$189.9
 
$150.2
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization197.5
 191.1
 188.9
Deferred tax expense (benefit) and investment tax credits(9.7) 4.2
 19.3
Equity component of allowance for funds used during construction(17.1) (13.8) (5.2)
Other11.3
 (0.7) 10.6
Other changes in assets and liabilities:     
Accounts receivable43.3
 (55.9) (0.7)
Sales of accounts receivable(7.0) (101.0) (10.0)
Regulatory assets(272.9) 71.4
 (129.0)
Regulatory liabilities(18.9) (82.3) (12.1)
Deferred income taxes140.4
 92.4
 64.6
Pension and other benefit obligations93.8
 (74.3) 21.0
Other50.8
 11.6
 (6.6)
Net cash flows from operating activities406.1
 232.6
 291.0
Cash flows used for investing activities:     
Utility construction and acquisition expenditures(526.0) (400.2) (307.5)
Other(26.7) (23.1) (23.7)
Net cash flows used for investing activities(552.7) (423.3) (331.2)
Cash flows from financing activities:     
Common stock dividends(140.0) (128.1) (122.9)
Preferred stock dividends(10.2) (10.8) (12.6)
Capital contributions from parent90.0
 120.0
 110.0
Payments to redeem cumulative preferred stock
 (150.0) 
Proceeds from issuance of cumulative preferred stock
 200.0
 
Proceeds from issuance of long-term debt250.0
 250.0
 
Payments to retire long-term debt(38.4) 
 
Net change in commercial paper
 (76.3) 69.2
Other(3.9) (14.2) (1.1)
Net cash flows from financing activities147.5
 190.6
 42.6
Net increase (decrease) in cash and cash equivalents0.9
 (0.1) 2.4
Cash and cash equivalents at beginning of period4.4
 4.5
 2.1
Cash and cash equivalents at end of period
$5.3
 
$4.4
 
$4.5
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest
($89.8) 
($80.7) 
($78.3)
Income taxes, net
$20.1
 
$0.1
 
($3.3)
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$113.2
 
$58.1
 
$53.4

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF COMMON EQUITY
       Total
   Additional   IPL
 Common Paid-In Retained Common
 Stock Capital Earnings Equity
 (in millions)
2012:       
Beginning balance
$33.4
 
$927.7
 
$433.3
 
$1,394.4
Earnings available for common stock    137.6
 137.6
Common stock dividends    (122.9) (122.9)
Capital contribution from parent  110.0
   110.0
Other  0.1
   0.1
Ending balance33.4
 1,037.8
 448.0
 1,519.2
2013:       
Earnings available for common stock    173.6
 173.6
Common stock dividends    (128.1) (128.1)
Capital contribution from parent  120.0
   120.0
Preferred stock issuance costs  (5.4)   (5.4)
Other  0.4
   0.4
Ending balance33.4
 1,152.8
 493.5
 1,679.7
2014:       
Earnings available for common stock    184.4
 184.4
Common stock dividends    (140.0) (140.0)
Capital contribution from parent  90.0
   90.0
Ending balance
$33.4
 
$1,242.8
 
$537.9
 
$1,814.1
 Year Ended December 31,
 2016 2015 2014
 (in millions)
Cash flows from operating activities:     
Net income
$225.8
 
$196.2
 
$191.8
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization210.8
 207.2
 197.5
Deferred tax expense (benefit) and tax credits35.6
 28.9
 (11.5)
Equity component of allowance for funds used during construction(35.2) (18.6) (17.1)
Other2.9
 19.5
 11.3
Other changes in assets and liabilities:     
Accounts receivable(59.7) 20.4
 43.3
Sales of accounts receivable16.0
 (17.0) (7.0)
Regulatory assets(54.7) (76.3) (272.9)
Accounts payable8.0
 (42.7) 18.8
Regulatory liabilities(67.3) (75.5) (18.9)
Deferred income taxes97.7
 82.1
 140.4
Pension and other benefit obligations13.1
 17.8
 93.8
Other(31.1) 43.0
 36.6
Net cash flows from operating activities361.9
 385.0
 406.1
Cash flows used for investing activities:     
Utility construction and acquisition expenditures(689.7) (619.3) (526.0)
Proceeds from Minnesota electric and natural gas distribution asset sales
 139.9
 
Other(3.9) (32.5) (26.7)
Net cash flows used for investing activities(693.6) (511.9) (552.7)
Cash flows from financing activities:     
Common stock dividends(151.9) (140.0) (140.0)
Capital contributions from parent190.0
 165.0
 90.0
Proceeds from issuance of long-term debt300.0
 250.0
 250.0
Payments to retire long-term debt
 (150.0) (38.4)
Other(7.6) 1.1
 (14.1)
Net cash flows from financing activities330.5
 126.1
 147.5
Net increase (decrease) in cash and cash equivalents(1.2) (0.8) 0.9
Cash and cash equivalents at beginning of period4.5
 5.3
 4.4
Cash and cash equivalents at end of period
$3.3
 
$4.5
 
$5.3
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest
($99.7) 
($93.9) 
($89.8)
Income taxes, net
($11.1) 
$19.3
 
$20.1
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$53.8
 
$77.0
 
$113.2

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.


INTERSTATE POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF COMMON EQUITY
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MANAGEMENT’S ANNUAL REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
       Total
   Additional   IPL
 Common Paid-In Retained Common
 Stock Capital Earnings Equity
 (in millions)
2014:       
Beginning balance
$33.4
 
$1,152.8
 
$461.9
 
$1,648.1
Earnings available for common stock    181.6
 181.6
Common stock dividends    (140.0) (140.0)
Capital contribution from parent  90.0
   90.0
Other  
 4.6
 4.6
Ending balance33.4
 1,242.8
 508.1
 1,784.3
2015:       
Earnings available for common stock    186.0
 186.0
Common stock dividends    (140.0) (140.0)
Capital contribution from parent  165.0
   165.0
Ending balance33.4
 1,407.8
 554.1
 1,995.3
2016:       
Earnings available for common stock    215.6
 215.6
Common stock dividends    (151.9) (151.9)
Capital contribution from parent  190.0
   190.0
Ending balance
$33.4
 
$1,597.8
 
$617.8
 
$2,249.0

The managementaccompanying Combined Notes to Consolidated Financial Statements are an integral part of Wisconsin Power and Light Company and subsidiary (WPL) is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. WPL’s internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America.

Because of the inherent limitations of internal control over financial reporting, misstatements may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

WPL’s management assessed the effectiveness of WPL’s internal control over financial reporting as of December 31, 2014 using the criteria set forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, WPL’s management concluded that, as of December 31, 2014, WPL’s internal control over financial reporting was effective.these statements.


/s/ Patricia L. Kampling
Patricia L. Kampling
Chairman and Chief Executive Officer


/s/ Thomas L. Hanson
Thomas L. Hanson
Senior Vice President and Chief Financial Officer


/s/ Robert J. Durian
Robert J. Durian
Controller and Chief Accounting Officer


February 24, 2015


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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors and Shareowner of
Wisconsin Power and Light Company
Madison, Wisconsin

We have audited the accompanying consolidated balance sheets of Wisconsin Power and Light Company and subsidiary (the “Company”) as of December 31, 20142016 and 2013,2015, and the related consolidated statements of income, equity, and cash flows for each of the three years in the period ended December 31, 2014.2016. Our audits also included the Company’s financial statement schedule listed in the Index at Item 15. These financial statements and the financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and the financial statement schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 20142016 and 2013,2015, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2014,2016, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, the financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

Milwaukee, Wisconsin
February 24, 20152017


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WISCONSIN POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF INCOME
Year Ended December 31,Year Ended December 31,
2014 2013 20122016 2015 2014
(in millions)(in millions)
Operating revenues:          
Electric utility
$1,220.3
 
$1,197.2
 
$1,218.2

$1,305.8
 
$1,266.7
 
$1,220.3
Gas utility221.0
 190.9
 169.6
151.4
 163.9
 221.0
Other7.8
 18.2
 4.2
1.9
 4.5
 7.8
Total operating revenues1,449.1
 1,406.3
 1,392.0
1,459.1
 1,435.1
 1,449.1
Operating expenses:          
Electric production fuel and energy purchases379.8
 342.9
 367.8
Purchased electric capacity0.1
 61.6
 117.8
Electric production fuel and purchased power423.5
 409.3
 379.9
Electric transmission service124.1
 116.9
 106.3
168.2
 157.1
 124.1
Cost of gas sold142.3
 116.4
 92.3
83.3
 95.8
 142.3
Other operation and maintenance277.2
 258.4
 240.0
219.8
 235.4
 277.2
Depreciation and amortization181.2
 172.2
 140.9
192.5
 184.3
 181.2
Taxes other than income taxes43.4
 41.8
 42.1
44.8
 44.5
 43.4
Total operating expenses1,148.1
 1,110.2
 1,107.2
1,132.1
 1,126.4
 1,148.1
Operating income301.0
 296.1
 284.8
327.0
 308.7
 301.0
Interest expense and other:          
Interest expense86.4
 85.0
 80.2
91.4
 92.4
 86.4
Equity income from unconsolidated investments(42.8) (43.7) (42.1)(39.8) (35.1) (42.8)
Allowance for funds used during construction(8.9) (9.8) (13.5)(10.5) (8.7) (8.9)
Interest income and other(0.1) (0.1) (0.1)(0.2) (0.4) (0.1)
Total interest expense and other34.6
 31.4
 24.5
40.9
 48.2
 34.6
Income before income taxes266.4
 264.7
 260.3
286.1
 260.5
 266.4
Income taxes85.6
 87.2
 94.6
93.3
 82.9
 85.3
Net income180.8
 177.5
 165.7
192.8
 177.6
 181.1
Net income attributable to noncontrolling interest0.7
 
 
2.4
 1.3
 0.7
Preferred dividend requirements
 1.6
 3.3
Earnings available for common stock
$180.1
 
$175.9
 
$162.4

$190.4
 
$176.3
 
$180.4

Earnings per share data is not disclosed given Alliant Energy Corporation is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented.
The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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WISCONSIN POWER AND LIGHT COMPANY
CONSOLIDATED BALANCE SHEETS
December 31,December 31,
2014 20132016 2015
(in millions)
(in millions, except per
share and share amounts)
ASSETS      
Current assets:      
Cash and cash equivalents
$46.7
 
$0.5

$4.2
 
$0.4
Accounts receivable, less allowance for doubtful accounts185.8
 198.4
226.3
 185.4
Production fuel, at weighted average cost31.1
 28.0
27.8
 38.6
Gas stored underground, at weighted average cost21.3
 25.1
Materials and supplies, at weighted average cost29.2
 28.9
36.3
 33.5
Gas stored underground, at weighted average cost36.3
 19.7
Regulatory assets29.4
 25.4
40.1
 80.6
Prepaid gross receipts tax38.0
 40.8
39.8
 39.2
Deferred income tax assets37.5
 43.3
Other23.2
 17.6
20.7
 20.7
Total current assets457.2
 402.6
416.5
 423.5
Property, plant and equipment, net3,938.9
 3,781.6
4,426.7
 4,103.7
Investments:      
Investment in American Transmission Company LLC286.5
 272.1

 293.3
Other19.5
 19.5
13.7
 15.4
Total investments306.0
 291.6
13.7
 308.7
Other assets:      
Regulatory assets396.4
 274.3
416.2
 425.4
Deferred charges and other29.7
 54.3
17.2
 9.1
Total other assets426.1
 328.6
433.4
 434.5
Total assets
$5,128.2
 
$4,804.4

$5,290.3
 
$5,270.4
LIABILITIES AND EQUITY   
Current liabilities:   
Commercial paper
$52.3
 
$19.9
Accounts payable192.9
 136.0
Accounts payable to associated companies34.6
 21.6
Regulatory liabilities36.6
 56.2
Accrued interest23.6
 23.7
Other54.7
 79.5
Total current liabilities394.7
 336.9
Long-term debt, net1,535.2
 1,533.9
Other liabilities:   
Deferred tax liabilities971.6
 1,005.4
Regulatory liabilities213.6
 192.3
Capital lease obligations - Sheboygan Falls Energy Facility77.2
 83.6
Pension and other benefit obligations207.8
 188.7
Other159.4
 162.0
Total other liabilities1,629.6
 1,632.0
Commitments and contingencies (Note 16)

 
Equity:   
Wisconsin Power and Light Company common equity:   
Common stock - $5 par value - 18,000,000 shares authorized; 13,236,601 shares outstanding66.2
 66.2
Additional paid-in capital1,019.0
 959.0
Retained earnings645.6
 731.1
Total Wisconsin Power and Light Company common equity1,730.8
 1,756.3
Noncontrolling interest
 11.3
Total equity1,730.8
 1,767.6
Total liabilities and equity
$5,290.3
 
$5,270.4

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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WISCONSIN POWER AND LIGHT COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS
WISCONSIN POWER AND LIGHT COMPANY
CONSOLIDATED BALANCE SHEETS (Continued)
 December 31,
 2014 2013
 
(in millions, except per
share and share amounts)
LIABILITIES AND EQUITY   
Current liabilities:   
Current maturities of long-term debt
$30.6
 
$8.5
Commercial paper
 183.7
Accounts payable112.9
 120.0
Accounts payable to associated companies25.5
 26.0
Regulatory liabilities70.4
 52.8
Accrued interest24.3
 22.2
Other46.6
 38.3
Total current liabilities310.3
 451.5
Long-term debt, net (excluding current portion)1,543.3
 1,323.6
Other liabilities:   
Deferred income tax liabilities970.0
 897.1
Regulatory liabilities167.3
 153.8
Capital lease obligations - Sheboygan Falls Energy Facility89.4
 94.5
Pension and other benefit obligations180.4
 88.4
Other155.2
 153.1
Total other liabilities1,562.3
 1,386.9
Commitments and contingencies (Note 16)

 
Equity:   
Wisconsin Power and Light Company common equity:   
Common stock - $5 par value - 18,000,000 shares authorized; 13,236,601 shares outstanding66.2
 66.2
Additional paid-in capital959.0
 959.0
Retained earnings678.6
 617.2
Total Wisconsin Power and Light Company common equity1,703.8
 1,642.4
Noncontrolling interest8.5
 
Total equity1,712.3
 1,642.4
Total liabilities and equity
$5,128.2
 
$4,804.4
 Year Ended December 31,
 2016 2015 2014
 (in millions)
Cash flows from operating activities:     
Net income
$192.8
 
$177.6
 
$181.1
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization192.5
 184.3
 181.2
Other amortizations(8.7) 5.3
 47.3
Deferred tax expense and tax credits114.5
 77.6
 82.6
Equity income from unconsolidated investments(39.8) (35.1) (42.8)
Distributions from equity method investments28.3
 30.6
 36.4
Other(6.3) (5.7) (7.2)
Other changes in assets and liabilities:     
Accounts receivable(47.6) 3.7
 2.2
Regulatory assets51.1
 (28.2) (166.9)
Pension and other benefit obligations19.1
 8.3
 92.0
Other25.5
 31.4
 18.5
Net cash flows from operating activities521.4
 449.8
 424.4
Cash flows used for investing activities:     
Utility construction and acquisition expenditures(453.0) (344.3) (312.9)
Other(25.9) (13.9) (7.2)
Net cash flows used for investing activities(478.9) (358.2) (320.1)
Cash flows used for financing activities:     
Common stock dividends(135.0) (126.9) (118.7)
Capital contribution from parent60.0
 
 
Proceeds from issuance of long-term debt
 
 250.0
Net change in commercial paper32.4
 19.9
 (183.7)
Other3.9
 (30.9) (5.7)
Net cash flows used for financing activities(38.7) (137.9) (58.1)
Net increase (decrease) in cash and cash equivalents3.8
 (46.3) 46.2
Cash and cash equivalents at beginning of period0.4
 46.7
 0.5
Cash and cash equivalents at end of period
$4.2
 
$0.4
 
$46.7
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest
($91.5) 
($93.1) 
($84.6)
Income taxes, net
$27.8
 
($7.4) 
($12.2)
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$93.1
 
$55.2
 
$38.4
Transfer of investment in ATC and tax liability to ATI
($163.6) 
$—
 
$—

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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WISCONSIN POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
 Year Ended December 31,
 2014 2013 2012
 (in millions)
Cash flows from operating activities:     
Net income
$180.8
 
$177.5
 
$165.7
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization181.2
 172.2
 140.9
Other amortizations47.3
 29.5
 43.7
Deferred taxes and investment tax credits80.7
 86.5
 88.6
Equity income from unconsolidated investments(42.8) (43.7) (42.1)
Distributions from equity method investments36.4
 35.4
 34.2
Equity component of allowance for funds used during construction(6.0) (6.5) (8.9)
Other(1.2) (0.2) (2.9)
Other changes in assets and liabilities:     
Regulatory assets(166.9) 69.1
 (49.1)
Regulatory liabilities29.7
 (8.5) 28.5
Accrued taxes0.1
 (26.9) 19.2
Pension and other benefit obligations92.0
 (71.3) 31.7
Other(6.9) 10.2
 (22.1)
Net cash flows from operating activities424.4
 423.3
 427.4
Cash flows used for investing activities:     
Utility construction and acquisition expenditures:     
Purchase of Riverside Energy Center
 
 (403.5)
Other(312.9) (331.4) (314.5)
Other(7.2) (4.5) 7.8
Net cash flows used for investing activities(320.1) (335.9) (710.2)
Cash flows from (used for) financing activities:     
Common stock dividends(118.7) (116.3) (112.0)
Preferred stock dividends
 (0.6) (3.3)
Capital contributions from parent
 
 90.0
Payments to redeem cumulative preferred stock
 (61.0) 
Proceeds from issuance of long-term debt250.0
 
 250.0
Net change in commercial paper(183.7) 97.1
 60.9
Other(5.7) (6.8) (4.8)
Net cash flows from (used for) financing activities(58.1) (87.6) 280.8
Net increase (decrease) in cash and cash equivalents46.2
 (0.2) (2.0)
Cash and cash equivalents at beginning of period0.5
 0.7
 2.7
Cash and cash equivalents at end of period
$46.7
 
$0.5
 
$0.7
Supplemental cash flows information:     
Cash (paid) refunded during the period for:     
Interest
($84.6) 
($85.0) 
($79.5)
Income taxes, net
($12.2) 
($22.9) 
$3.3
Significant non-cash investing and financing activities:     
Accrued capital expenditures
$38.4
 
$37.7
 
$39.5

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.

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WISCONSIN POWER AND LIGHT COMPANY
CONSOLIDATED STATEMENTS OF EQUITY
Total WPL Common Equity    Total WPL Common Equity    
  Additional        Additional      
Common Paid-In Retained Noncontrolling TotalCommon Paid-In Retained Noncontrolling Total
Stock Capital Earnings Interest EquityStock Capital Earnings Interest Equity
(in millions)(in millions)
2012:         
2014:         
Beginning balance
$66.2
 
$869.0
 
$507.2
 
$—
 
$1,442.4

$66.2
 
$959.0
 
$622.2
 
$—
 
$1,647.4
Earnings available for common stock    162.4
   162.4
Net income    180.4
 0.7
 181.1
Common stock dividends    (112.0)   (112.0)    (118.7)   (118.7)
Capital contribution from parent  90.0
     90.0
Contributions from noncontrolling interest      8.6
 8.6
Distributions to noncontrolling interest      (0.8) (0.8)
Other  0.2
     0.2
    (2.2)   (2.2)
Ending balance66.2
 959.2
 557.6
 
 1,583.0
66.2
 959.0
 681.7
 8.5
 1,715.4
2013:         
Earnings available for common stock    175.9
   175.9
Common stock dividends    (116.3)   (116.3)
Other  (0.2)     (0.2)
Ending balance66.2
 959.0
 617.2
 
 1,642.4
2014:         
2015:         
Net income    180.1
 0.7
 180.8
    176.3
 1.3
 177.6
Common stock dividends    (118.7)   (118.7)    (126.9)   (126.9)
Contributions from noncontrolling interest      8.6
 8.6
      3.4
 3.4
Distributions to noncontrolling interest      (0.8) (0.8)      (1.9) (1.9)
Ending balance
$66.2
 
$959.0
 
$678.6
 
$8.5
 
$1,712.3
66.2
 959.0
 731.1
 11.3
 1,767.6
2016:         
Net income    190.4
 2.4
 192.8
Common stock dividends    (135.0)   (135.0)
Capital contribution from parent  60.0
     60.0
Contributions from noncontrolling interest      11.5
 11.5
Distributions to noncontrolling interest      (2.5) (2.5)
Transfer of investment in ATC to ATI    (140.9) (22.7) (163.6)
Ending balance
$66.2
 
$1,019.0
 
$645.6
 
$—
 
$1,730.8

The accompanying Combined Notes to Consolidated Financial Statements are an integral part of these statements.


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ALLIANT ENERGY CORPORATION
INTERSTATE POWER AND LIGHT COMPANY
WISCONSIN POWER AND LIGHT COMPANY

COMBINED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1)NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
(a)NOTE 1(a) General -
Description of Business - Alliant Energy’s financial statements include the accounts of Alliant Energy and its consolidated subsidiaries. Alliant Energy is an investor-owned public utility holding company, whose primary wholly-owned subsidiaries are IPL, WPL, ResourcesAEF and Corporate Services.

IPL’s financial statements include the accounts of IPL and its consolidated subsidiary, IPL SPE LLC, which is used for IPL’s sales of accounts receivable program. IPL is a direct subsidiary of Alliant Energy and is a public utility engaged principally in the generation and distribution of electricity and the distribution and transportation of natural gas.gas to retail customers in select markets in Iowa. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa, and is also engaged in the generation and distribution of steam for two customers in Cedar Rapids, Iowa. IPL’s service territories are located in Iowa and southern Minnesota. Refer to Note 3 for discussion of IPL’s anticipated sales of its Minnesota electric and natural gas distribution assets.

WPL’s financial statements include the accounts of WPL and its consolidated subsidiary, WPL Transco, which holdsheld Alliant Energy’s investment in ATC.ATC until December 31, 2016. Refer to Note 6(a) for discussion of WPL’s transfer of its investment in ATC to ATI on December 31, 2016. WPL is a direct subsidiary of Alliant Energy and is a public utility engaged principally in the generation and distribution of electricity and the distribution and transportation of natural gas. WPL’s service territories are locatedgas to retail customers in southern and centralselect markets in Wisconsin. WPL also sells electricity to wholesale customers in Wisconsin.

ResourcesAEF is comprised of Transportation, Non-regulated Generation, ATI and other non-regulated investments. Transportation includes a short-line railway that provides freight service between Cedar Rapids, Iowa and Iowa City, Iowa; barge terminal and hauling services on the Mississippi River; and other transfer and storage services. Non-regulated Generation owns Sheboygan Falls, a 347 MW, simple-cycle, natural gas-fired EGU near Sheboygan Falls, Wisconsin, which is leased to WPL for an initial period of 20 years ending in 2025. In addition, Non-regulated Generation currently owns the non-regulated 99 MW Franklin County wind projectfarm located in Franklin County, Iowa. In February 2017, FERC issued an order approving the transfer of the Franklin County wind farm from AEF to IPL. Alliant Energy and IPL currently expect to complete this transfer in 2017. ATI, a wholly-owned subsidiary of AEF, held a partial interest in WPL Transco until December 31, 2016. As of December 31, 2016, ATI holds all of Alliant Energy’s investment in ATC. Refer to Note 6(a) for further discussion of ATI, a wholly-owned subsidiarythe transfer of Resources, which holds a partial interest in WPL Transco. ReferWPL’s ATC investment to Note 19 for discussion of Alliant Energy’s RMT business, which was sold in 2013.ATI.

Corporate Services is the subsidiary formed to provide administrative services to Alliant Energy and its subsidiaries.

Basis of Presentation - The financial statements reflect investments in controlled subsidiaries on a consolidated basis and Alliant Energy’s, IPL’s and WPL’s proportionate shares of jointly-owned utility EGUs. Unconsolidated investments, which Alliant Energy and WPL do not control, but do have the ability to exercise significant influence over operating and financial policies, are accounted for under the equity method of accounting. Under the equity method of accounting, Alliant Energy and WPL initially record the investment at cost, and adjust the carrying amount of the investment to recognize their respective share of the earnings or losses of the investee. Dividends received from an investee reduce the carrying amount of the equity investment. Investments that do not meet the criteria for consolidation or the equity method of accounting are accounted for under the cost method. Refer to Notes 1(n)1(m) and 6(a) for further discussion of VIEs and equity method investments, respectively.

All intercompany balances and transactions, other than certain transactions affecting the rate-making process at IPL and WPL, have been eliminated from the financial statements. Such transactions not eliminated include costs that are recoverable from customers through rate-making processes. The financial statements are prepared in conformity with GAAP, which give recognition to the rate-making and accounting practices of FERC and state commissions having regulatory jurisdiction. Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes. The balance sheets presentation changed from a utility format to a traditional format. This change revised the order of certain balance sheet line items and did not result in any changes in classification of amounts between line items. Unless otherwise noted, the notes herein exclude discontinued operations for all periods presented. As discussed in Note 7, all Alliant Energy share and per share amounts have been adjusted to reflect a two-for-one common stock split distributed in May 2016. As required by GAAP, all prior period financial statements and disclosures presented and assets and liabilities held for sale as of December 31, 2014.herein have been restated to reflect the common stock split.


Use of Estimates - The preparation of the financial statements requires management to make estimates and assumptions that affect: (a) the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements; and (b) the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.


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(b)NOTE 1(b) Regulatory Assets and Regulatory Liabilities - Alliant Energy, IPL and WPL are subject to regulation by FERC and various state regulatory commissions. As a result, Alliant Energy, IPL and WPL are subject to GAAP provisions for regulated operations, which provide that rate-regulated public utilities record certain costs and credits allowed in the rate-making process in different periods than for non-regulated entities. Regulatory assets generally represent incurred costs that have been deferred as such costs are probable of recovery in future customer rates. Regulatory liabilities generally represent obligations to make refunds to customers or amounts collected in rates for which the related costs have not yet been incurred. Amounts deferred as regulatory assets or accrued as regulatory liabilities are generally recognized in the income statements at the time they are reflected in rates. Refer to Note 2 for additional discussion of regulatory assets and regulatory liabilities.

(c)NOTE 1(c) Income Taxes - The liability method of accounting is followed for deferred income taxes, which requires the establishment of deferred income tax assets and liabilities, as appropriate, for temporary differences between the tax basis of assets and liabilities and the amounts reported in the financial statements. Deferred income taxes are recorded using currently enacted tax rates and estimates of state apportionment rates.apportionment. Changes in deferred income tax assets and liabilities associated with certain property-related differences at IPL are accounted for differently than other subsidiaries of Alliant Energy due to rate-making practices in Iowa. Rate-making practices in Iowa do not include the impact of certain deferred tax expenses (benefits) in the determination of retail rates. Based on these rate-making practices, deferred tax expense (benefit) related to these property-related differences at IPL is not recorded in the income statement but instead recorded to regulatory assets or regulatory liabilities until these temporary differences reverse. Refer to Note 2 for further discussion of these tax regulatory assets and regulatory liabilities associated with property-related differences at IPL. In Wisconsin, the PSCW has allowed rate recovery of deferred tax expense on all temporary differences since 1991.

Investment tax credits are deferred and amortized to income over the average lives of the related property. Other tax credits reduce income tax expense in the year claimed.

The alternative transition method has been elected to calculate the beginning pool of excess tax benefits available to absorb any tax deficiencies associated with recognition of share-based payment awards.

Alliant Energy files a consolidated federal income tax return and a combined return in Wisconsin, which includes the aggregate taxable income or loss ofinclude Alliant Energy and its subsidiaries. In addition, a combined return including Alliant Energy and all of its subsidiaries is filed in Wisconsin. Alliant Energy subsidiaries with a presence in Iowa file as part of a consolidated return in Iowa. Under the terms of a tax sharing agreement between

Alliant Energy andallocates consolidated income tax expense to its subsidiaries that are members of the group that file a consolidated or combined income tax return. IPL and WPL calculate stateuse the modified separate return approach for calculating their income tax usingprovisions and related deferred tax assets and liabilities. IPL and WPL are assumed to file separate tax returns with the federal and state taxing authorities, except that net operating losses (and other current or deferred tax attributes) are characterized as realized (or realizable) by IPL and WPL when those tax attributes are realized (or realizable) by the consolidated apportionment rates appliedtax return group of Alliant Energy (even if IPL and WPL would not otherwise have realized the attributes on a stand-alone basis). The difference in the income taxes recorded for IPL and WPL under the modified separate return method compared to the income taxes recorded on a separate company taxable income.return basis was not material in 2016, 2015 and 2014.

(d)NOTE 1(d) Cash and Cash Equivalents - Cash and cash equivalents include short-term liquid investments that have original maturities of less than 90 days.

(e)NOTE 1(e) Property, Plant and Equipment -
Utility Plant -
General - Utility plant is recorded at the original cost of acquisition or construction, which includes material, labor, contractor services, AFUDC and allocable overheads, such as supervision, engineering, benefits, certain taxes and transportation. Repairs, replacements and renewals of items of property determined to be less than a unit of property or that do not increase the property’s life or functionality are charged to maintenance expense. OrdinaryGenerally, ordinary retirements of utility plant and salvage value are netted and charged to accumulated depreciation upon removal from utility plant accounts and no gain or loss is recognized consistent with rate-making policies. Removal costs incurred reduceHowever, if regulators have approved recovery of the remaining net book value of property, plant and equipment that is retired early, the remaining net book value is reclassified from property, plant and equipment to regulatory liability.assets upon retirement. Property, plant and equipment that is probable of being retired early is classified as plant anticipated to be retired early.

Depreciation - IPL and WPL use a combination of remaining life and straight-line depreciation methods as approved by their respective regulatory commissions. The composite or group method of depreciation is used, in which a single depreciation

rate is applied to the gross investment in a particular class of property. This method pools similar assets and then depreciates each group as a whole. Periodic depreciation studies are performed to determine the appropriate group lives, net salvage, estimated cost of removal and group depreciation rates. These depreciation studies are subject to review and approval by IPL’s and WPL’s respective regulatory commissions. Depreciation expense is included within the recoverable cost of service component of rates charged to customers. The average rates of depreciation for electric, gas and other properties, consistent with current rate-making practices, were as follows:

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IPL WPLIPL WPL
2014 2013 2012 2014 2013 (a) 20122016 2015 2014 2016 2015 2014
Electric - generation3.6% 3.6% 3.7% 3.2% 3.3% 3.2%3.5% 3.6% 3.6% 3.1% 3.2% 3.2%
Electric - distribution2.5% 2.5% 2.5% 2.7% 2.7% 2.9%2.4% 2.4% 2.5% 2.6% 2.7% 2.7%
Electric - other4.2% 4.0% 4.0% 4.7% 4.5% 5.9%
Gas3.3% 3.4% 3.4% 2.5% 2.5% 2.6%3.3% 3.2% 3.3% 2.5% 2.5% 2.5%
Other4.2% 4.4% 4.5% 6.0% 5.1% 5.3%3.9% 3.9% 4.3% 5.9% 6.0% 6.0%

(a)In 2012, the PSCW issued an order approving the implementation of updated depreciation rates for WPL effective January 1, 2013 as a result of a recently completed depreciation study. In 2013, the PSCW and FERC issued orders approving WPL’s requests to revise depreciation rates associated with the acquisition of Riverside effective January 1, 2013.
In September 2016, the PSCW issued an order approving the implementation of updated depreciation rates for WPL effective January 1, 2017 as a result of a recently completed depreciation study. WPL estimates the new average rates of depreciation for its electric generation, electric distribution and gas properties will be approximately 3.2%, 2.6% and 2.3%, respectively, during 2017.

AFUDC - AFUDC represents costs to finance construction additions, including a return on equity component and cost of debt component as required by regulatory accounting. AFUDC for IPL’s construction projects is calculated in accordance with FERC guidelines. AFUDC for WPL’s retail and wholesale jurisdiction construction projects is calculated in accordance with PSCW and FERC guidelines, respectively. The AFUDC recovery rates, computed in accordance with the prescribed regulatory formula, were as follows:
 2014 2013 2012
IPL (FERC formula - Marshalltown CWIP) (a)8.0% —% —%
IPL (FERC formula - other CWIP)7.8% 8.2% 8.2%
WPL (PSCW formula - retail jurisdiction)8.2% 8.2% 8.8%
WPL (FERC formula - wholesale jurisdiction)4.1% 4.5% 7.9%
 2016 2015 2014
IPL (Marshalltown CWIP) (a)7.9% 7.9% 8.0%
IPL (other CWIP)7.7% 7.7% 7.8%
WPL (retail jurisdiction)8.2% 8.2% 8.2%
WPL (wholesale jurisdiction)6.7% 7.9% 4.1%

(a)In 2013, the IUB issued an order establishing rate-making principles for Marshalltown that requires a 10.3% return on common equity for the calculation of AFUDC related to the construction of such facility.

In accordance with their most recent rate orders, IPL applies its AFUDC recovery rates to 100% of applicable CWIP balances and WPL generally applies its AFUDC recovery rates to 50% of applicable CWIP balances. WPL may apply its AFUDC recovery rates to 100% of the retail portion of the CWIP balances for construction projects requiring a CA or CPCN that were approved by the PSCW after theirits most recent rate order.order, including the Riverside expansion.

Non-utility Property -
General - Non-utility property is recorded at the original cost of acquisition or construction, which includes material, labor and contractor services. Repairs, replacements and renewals of items of property determined to be less than a unit of property or that do not increase the property’s life or functionality are charged to maintenance expense. Upon retirement or sale of non-utility property, the original cost and related accumulated depreciation are removed from the accounts and any gain or loss is included in the income statements.

Costs related to software developed or obtained for internal use are capitalized and amortized on a straight-line basis over the estimated useful life of the related software. If software is retired prior to being fully amortized, the difference is recorded as a loss in the income statements.

(f)NOTE 1(f) Operating Revenues -
Utility - Revenues from Alliant Energy’s utility business are primarily from electricity and natural gas sales and are recognized on an accrual basis as services are rendered or commodities are delivered to customers. Energy sales to individual customers are based on the reading of customers’ meters, which occurs on a systematic basis throughout each reporting period. Amounts of energy delivered to customers since the date of the last meter reading are estimated at the end of each reporting period and the corresponding estimated unbilled revenue is recorded in such reporting period. The unbilled revenue estimate is based on daily system demand volumes, estimated customer usage by class, weathertemperature impacts, line losses and the most recent customer rates.

IPL and WPL accrue revenues from their wholesale customers to the extent that the actual net revenue requirements calculated in accordance with FERC-approved formula rates for the reporting period are higher or lower than the amounts billed to wholesale customers during such period. Regulatory assets or regulatory liabilities are recorded as the offset for these accrued revenues under formulaic rate-making programs. IPL’s estimated recovery amount is recorded in the current period of service and is reflected in customer bills within two years under the provisions of approved formula rates. WPL’s estimated recovery amount is recorded in the current period of service and subject to final adjustments after a customer audit period in the subsequent year. Final settled recovery amounts are reflected in WPL’s customer bills within two years under the provisions of approved formula rates.


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IPL and WPL participate in bid/offer-based wholesale energy and ancillary services markets operated by MISO. IPL’s and WPL’s customers and generating resources are located in the MISO region. MISO requires that all load serving entities and generation owners, including IPL and WPL, submit hourly day-ahead and/or real-time bids and offers for energy and ancillary services. The MISO day-ahead and real-time transactions are grouped together, resulting in a net supply to or net purchase from MISO for each hour of each day. The net supply to MISO is recorded in “Electric utility operating revenues” and the net purchase from MISO is recorded in “Electric production fuel and energy purchases”purchased power” in the income statements. IPL and WPL also engage in transactions in PJM’s bid/offer-based wholesale energy market, which are accounted for similar to the MISO transactions.

Non-regulated - Revenues from Alliant Energy’s non-regulated businesses are primarily from its Transportation business and are recognized on an accrual basis as services are rendered or goods are delivered to customers.

Taxes Collected from Customers - CertainSales or various other taxes collected by certain of Alliant Energy’s subsidiaries serve as collection agents for sales or variouson behalf of other taxes and record revenuesagencies are recorded on a net basis. Operating revenues dobasis and are not include the collection of the aforementioned taxes.included in operating revenues.

Revenue Recognition - Refer to Note 1(p)1(o) for discussion of a new accounting standard recently issued by FASB,the Financial Accounting Standards Board in 2014, which provides principles for recognizing revenue.

(g)NOTE 1(g) Utility Cost Recovery Mechanisms -
Electric Production Fuel and Energy PurchasesPurchased Power (Fuel-related Costs) - Fuel-related costs are incurred each period to generate and purchase electricity to meet the demand of IPL’s and WPL’s electric customers. These fuel-related costs include the cost of fossil fuels (primarily coalnatural gas and natural gas)coal) used during each period to produce electricity at their EGUs, electricity purchased each period from MISO wholesale energy markets (primarily MISO) and under PPAs, costs for allowances acquired to allow certain emissions (primarily SO2 and NOx) from their EGUs and costs for chemicals utilized to control emissions from their EGUs. These fuel-related costs are recorded in “Electric production fuel and energy purchases”purchased power” in the income statements.

IPL Retail - The cost recovery mechanisms applicable for IPL’s retail electric customers provide for subsequentmonthly adjustments to their electric rates each month for changes in fuel-related costs. Fuel adjustment clause rules applicable to IPL’s Iowa retail jurisdiction also currently allow IPL to recoverrecovery of prudently incurred costs for emission allowances required to comply with EPA regulations including the Acid Rain program and CAIR, through the fuel adjustment clause. Changes in the under-/over-collection of these costs each period are recognized in “Electric production fuel and energy purchases”purchased power” in Alliant Energy’s and IPL’s income statements. The cumulative effects of the under-/over-collection of these costs are recorded in current “Regulatory assets”regulatory assets or current “Regulatory liabilities”regulatory liabilities on Alliant Energy’s and IPL’s balance sheets until they are reflected in future billings to customers. The fuel adjustment clause rules applicable to IPL’s Iowa retail jurisdiction currently do not contain a provision for recovery of emission controls chemical costs to flow through the fuel adjustment clause. The fuel adjustment clause rules applicable to IPL’s Minnesota retail jurisdiction currently do not contain a provision for recovery of emission allowance costs or emission controls chemical costs through the fuel adjustment clause.

Effective February 22, 2014, IPL began recovering the Iowa retail portion of the DAEC PPA costs from its Iowa retail electric customers through the fuel adjustment clause pursuant to a January 2013 IUB order. This PPA does not contain minimum payments for electric generating capacity.

WPL Retail - The cost recovery mechanism applicable for WPL’s retail electric customers is based on forecasts of certain fuel-related costs expected to be incurred during forward-looking test year periods and fuel monitoring ranges determined by the PSCW during each retail electric retail rate proceeding or in a separate fuel cost plan approval proceeding. However, ifIf WPL’s actual fuel-related costs fall outside these fuel monitoring ranges, during the test period, WPL is authorized to defer the incremental under-/over-collection of fuel-related costs that are outside the approved ranges. Deferral of under-collections are reduced to the extent actual return on common equity earned by WPL during the fuel cost plan year exceeds the most recently authorized return on common equity. Deferred amounts for fuel-related costs outside the approved fuel monitoring ranges are recognized in “Electric production fuel and energy purchases”purchased power” in Alliant Energy’s and WPL’s income statements each period.statements. The cumulative effects of these deferred amounts are recorded in current “Regulatory assets”regulatory assets or current “Regulatory liabilities”regulatory liabilities on Alliant Energy’s and WPL’s balance sheets until they are reflected in future billings to customers. WPL’s retail fuel-related costs include costs for emission allowances and emission controls chemicals.

IPL and WPL Wholesale - The cost recovery mechanisms applicable for IPL’s and WPL’s wholesale electric customers provide for subsequent adjustments to their electric rates for changes in fuel-related costs. Changes in the under-/over-collection of these costs are recognized in “Electric production fuel and energy purchases”purchased power” in the income statements each period.statements. The cumulative effects of the under-/over-collection of these costs are recorded in current “Regulatory assets”regulatory assets or

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current “Regulatory liabilities” regulatory liabilities on the balance sheets until they are reflected in future billings to customers. IPL’s and WPL’s costs for emission allowances and emission controls chemicals are excluded from the fuel-relatedfuel-

related cost recovery mechanisms and are recovered from their wholesale electric customers through annual changes in base rates determined by a formula rate structure.

Purchased Electric Capacity - PPAs help meet the electricity demand of IPL’s and WPL’s customers. Certain of these PPAs include minimum payments for IPL’s and WPL’s rights to electric generating capacity, which are charged each period to “Purchased electric capacity”“Electric production fuel and purchased power” in the income statements. Purchased electric capacity expenses are recovered from IPL’s and WPL’s retail electric customers through changes in base rates determined during periodic rate proceedings. Purchased electric capacity expenses are recovered from IPL’s and WPL’s wholesale electric customers through annual changes in base rates determined by a formula rate structure.

Electric Transmission Service - Costs incurred for the transmission of electricity to meet the demands of IPL’s and WPL’s customers are charged each period to “Electric transmission service” in the income statements.

IPL Retail - Electric transmission service expense is recovered from IPL’s Iowa retail electric customers through a transmission cost rider. This cost recovery mechanism provides for annual adjustments to electric rates charged to Iowaretail electric retail customers for changes in electric transmission service expense. Changes in the under-/over-collection of these costs are recognized in “Electric transmission service” in Alliant Energy’s and IPL’s income statements each period.statements. The cumulative effects of the under-/over-collection of these costs are recorded in current “Regulatory assets”regulatory assets or current “Regulatory liabilities”regulatory liabilities on Alliant Energy’s and IPL’s balance sheets until they are reflected in future billings to customers. The transmission cost rider will remain in effect until the IUB’s final decision in IPL’s next retail electric base rate case, at which time the rider will continue in its current form, continue in a modified form or be terminated.

WPL Retail - Electric transmission service expense is recovered from WPL’s retail electric customers through changes in base rates determined during periodic rate proceedings.

Pursuant to the escrow accounting treatment WPL received as part of its approved retail electric rate case (2015/2016 Test Period) in July 2014 from the PSCW, the difference between actual electric transmission service expense incurred and the amount of electric transmission service costs collected from customers as electric revenues in 2015 and 2016 will beis recognized in “Electric transmission service” in Alliant Energy’s and WPL’s income statements each period.statements. An offsetting amount will beis recorded in “Regulatory assets”regulatory assets or “Regulatory liabilities”regulatory liabilities on Alliant Energy’s and WPL’s balance sheets until they are reflected in future billings to customers. The PSCW’s December 2016 order for WPL’s retail electric rate case (2017/2018 Test Period) extends this escrow accounting treatment through 2018.

IPL and WPL Wholesale - IPL and WPL arrange transmission service for the majority of their respective wholesale electric customers. Electric transmission service expense is allocated to and recovered from these customers based on a load ratio share computation.

Cost of Gas Sold - Costs are incurred for the purchase, transportation and storage of natural gas to serve IPL’s and WPL’s gas customers and the costs associated with the natural gas delivered to customers during each period are charged to “Cost of gas sold” in the income statements. The tariffs for IPL’s and WPL’s retail gas customers provide for subsequent adjustments to their rates each month for changes in the cost of gas sold. Changes in the under-/over-collection of these costs are also recognized in “Cost of gas sold” in the income statements each period.statements. The cumulative effects of the under-/over-collection of these costs are recorded in current “Regulatory assets”regulatory assets or current “Regulatory liabilities”regulatory liabilities on the balance sheets until they are reflected in future billings to customers.

Energy Efficiency Costs - Costs are incurred to fund energy efficiency programs and initiatives that help customers reduce their energy usage. The costs incurred for these programs and initiatives are charged to “Utility - Other“Other operation and maintenance” in the income statements each period.statements. Energy efficiency costs incurred by IPL are recovered from its retail electric and gas customers in Iowa through an additional tariff called an EECR factor. EECR factors areenergy efficiency cost recovery factor, which is revised annually and includeincludes a reconciliation to eliminate any under-/over-collection of energy efficiency costs from prior periods. Energy efficiency costs incurred by WPL are recovered from retail electric and gas customers through changes in base rates determined during periodic rate proceedings. Reconciliations of any under-/over-collection of energy efficiency costs from prior periods are also addressed in WPL’s periodic rate proceedings. Changes in the under-/over-collection of energy efficiency costs each period for IPL and WPL are recognized in “Utility - Other“Other operation and maintenance” in the income statements. The cumulative effects of the under-/over-collection of these costs for IPL and WPL are recorded in current “Regulatory assets”regulatory assets or current “Regulatory liabilities”regulatory liabilities on the balance sheets until they are reflected in future billings to customers.


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Table of Contents


Refer to Note 2 for additional information regarding these utility cost recovery mechanisms.


(h)NOTE 1(h) Financial Instruments - Financial instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. The fair value of those financial instruments that are determined to be derivatives are recorded as assets or liabilities on the balance sheets. At the end of each reporting period, derivative instruments representing unrealized gain positions are reported as derivative assets, and derivative instruments representing unrealized loss positions are reported as derivative liabilities. Certain commodity purchase and sales contracts qualify for and have been designated under the normal purchase and sale exception. Based on this designation, such contractsexception and are accounted for on the accrual basis of accounting. Alliant Energy, IPL and WPL have elected to not net the fair value amounts of derivatives subject to a master netting arrangement by counterparty. Alliant Energy, IPL and WPL do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments that are executed with the same counterparty under the same master netting arrangement. Refer to Note 2 for discussion of the recognition of regulatory assets and regulatory liabilities related to the unrealized losses and gains on IPL’s and WPL’s derivative instruments. Refer to Notes 14, 15 and 16(f) for further discussion of derivatives and related credit risk.

(i)NOTE 1(i) Asset Impairments -
Property, Plant and Equipment of Regulated Operations - Property, plant and equipment of regulated operations are reviewed for possible impairment whenever events or changes in circumstances indicate all or a portion of the carrying value of the assets may be disallowed for rate-making purposes. If IPL or WPL are disallowed recovery of any portion of the carrying value of their regulated property, plant and equipment that is under construction, has been recently completed or is probable of abandonment, or conclude it is probable recovery will be disallowed, an impairment charge is recognized equal to the amount of the carrying value that was disallowed or is probable of being disallowed. If IPL or WPL are disallowedonly allowed a full or partial return on the carrying value of their regulated property, plant and equipment that is under construction, has been recently completed or is probable of abandonment, or conclude it is probable a full return will not be allowed, an impairment charge is recognized equal to the difference between the carrying value and the present value of the future revenues expected from their regulated property, plant and equipment. Refer to Note 3 for discussion of adjustments made by Alliant Energy and IPL in 2013 to the carrying value of IPL’s Whispering Willow - East wind project, based on the MPUC approving full cost recovery of the Minnesota retail portion of the wind project construction costs in 2013.

Property, Plant and Equipment of Non-regulated Operations - Property, plant and equipment of non-regulated operations are reviewed for possible impairment whenever events or changes in circumstances indicate the carrying value of the assets may not be recoverable. Impairment is indicated if the carrying value of an asset exceeds its undiscounted future cash flows. AnIf an impairment is indicated, a charge is recognized equal to the amount the carrying value exceeds the asset’s fair value. Refer to Note 3 for discussion of Alliant Energy’s impairment analysis of the Franklin County wind farm assets in 2016 and resulting asset valuation charges recorded by Alliant Energy in 2016.

Unconsolidated Equity Investments - If events or circumstances indicate the carrying value of investments accounted for under the equity method of accounting may not be recoverableexceeds fair value and the decline in value is other than temporary, potential impairment is assessed. If an impairment is indicated, a charge is recognized equal to the amount the carrying value exceeds the investment’s fair value. Refer to Note 6(a) for additional discussion of investments accounted for under the equity method of accounting.

(j) Emission Allowances - Emission allowances are granted by the EPA at zero cost and permit the holder of the allowances to emit certain gaseous by-products of fossil fuel combustion, including SO2 and NOx. Purchased emission allowances are recorded as intangible assets at their original cost and evaluated for impairment as long-lived assets to be held and used. Emission allowances allocated or acquired are held primarily for consumption.

Amortization of emission allowances recorded in “Electric production fuel and energy purchases” in the income statements in 2014, 2013 and 2012 was not material, and is based upon a weighted average cost for each EPA compliance program category of vintage year utilized during the reporting period. As of December 31, 2014, future estimated amortization expense for emission allowances was not material for 2015 through 2019.

Cash inflows and outflows related to sales and purchases of emission allowances are presented in investing activities in the cash flows statements. Refer to Note 2 for information regarding regulatory assets related to emission allowances.

(k)NOTE 1(j) Asset Retirement Obligations - The fair value of a legal obligation associated with the retirement costs of an asset is recorded as a liability with an equivalent amount added to the asset cost when an asset is placed in service, when a legal obligation is subsequently identified or when sufficient information becomes available to determine a reasonable estimate of the fair value of future retirement costs. When an ARO is recorded as a liability, an equivalent amount is added to the asset cost. The fair value of AROs at inception is determined using discounted cash flows analyses. The liability is accreted to its present value and the capitalized cost is depreciated over the useful life of the related asset.

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Accretion and depreciation expenses related to AROs for IPL’s and WPL’s regulated operations are recorded to regulatory assets on the balance sheets. Upon regulatory approval to recover IPL’s AROs expenditures, its regulatory assets are amortized to depreciation and amortization expenses in Alliant Energy’s and IPL’s income statements over the same time period that IPL’s customer rates are increased to recover the ARO expenditures. Effective January 1, 2013,expenditures are recovered from IPL’s customers. WPL’s regulatory assets related to AROs are being recovered as a component of depreciation rates included in the most recent depreciation study approved by thepursuant to PSCW in its May 2012 order.and FERC orders. Accretion and depreciation expenses related to AROs for Alliant Energy’s non-regulated operations are recorded to depreciation and amortization expenses in Alliant Energy’s income statements. Upon settlement of the ARO liability, an entity settles the obligation for its recorded amount or incurs a gain or loss. Any gains or losses related to AROs for IPL’s and WPL’s regulated operations are recorded to regulatory liabilities or regulatory assets on the balance sheets. Refer to Note 13 for additional discussion of AROs.


(l)NOTE 1(k) Debt Issuance and Retirement Costs - Debt issuance costs and debt premiums or discounts are presented on the balance sheet as a direct deduction from the carrying amount of the related debt liability, and are deferred and amortized over the expected life of each debt issue, considering maturity dates and, if applicable, redemption rights held by others. Alliant Energy’s non-regulated businesses and Corporate Services expense in the period of retirement any unamortized debt issuance costs and debt premiums or discounts on debt retired early. Refer to Note 2 for information on regulatory assets related to IPL’s and WPL’s debt retired early or refinanced.

(m)NOTE 1(l) Allowance for Doubtful Accounts - Allowances for doubtful accounts are recorded for estimated losses resulting from the inability of customers to make required payments. Allowances for doubtful accounts are estimated based on historical write-offs, customer arrears and other economic factors within IPL’s and WPL’s service territories. Refer to Note 5(a) for details of allowance for doubtful accounts.

(n)NOTE 1(m) Variable Interest Entities - An entity is considered a VIE if its equity investors do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties, or its equity investors lack any of the following characteristics: (1) power, through voting rights or similar rights, to direct the activities of the entity that most significantly impact the entity’s economic performance; (2) the obligation to absorb expected losses of the entity; or (3) the right to receive expected benefits of the entity. The primary beneficiary of a VIE is required to consolidate the VIE. The financial statements did not reflect any VIEs on a consolidated basis.

(o)NOTE 1(n) Cash Flows Presentation - Alliant Energy presents cash flows from continuing operations together with cash flows from discontinued operations in its cash flows statements.

(p)NOTE 1(o) New Accounting PronouncementsStandards -
Revenue Recognition - In May 2014, FASBthe Financial Accounting Standards Board issued an accounting standard providing principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard also requires disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Alliant Energy, IPL and WPL are requiredcurrently expect to adopt this standard on January 1, 20172018. Upon adoption, the standard can be applied retrospectively to all prior reporting periods presented, or retrospectively with a cumulative effect to the opening retained earnings balance on January 1, 2018. Alliant Energy, IPL and WPL are currently evaluating the impact of this standard on their financial condition and results of operations.

Discontinued Operations - In April 2014, FASB issued an accounting standard that changes the criteria for reporting and qualifying for discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operational and financial results. The new standard also requires additional disclosures about discontinued operations and individually significant components of an entity that are disposed of or that are classified as held for sale and do not qualifyanticipate a significant change in revenue recognition for discontinued operations. Inretail electric and gas sales, which represent the fourth quartermajority of 2014,Alliant Energy’s, IPL’s and WPL’s revenues. Alliant Energy, IPL and WPL electedcontinue to early adoptevaluate additional impacts of this standard, as well as which transition method will be utilized.

Leases - In February 2016, the newFinancial Accounting Standards Board issued an accounting standard which is applied prospectively. Asrequiring lease assets and lease liabilities, including operating leases, to be recognized on the balance sheet for all leases with terms longer than 12 months. The standard also requires disclosure of December 31, 2014, IPL’s Minnesota natural gas distribution assets qualified as held for sale.key information about leasing arrangements. Alliant Energy, IPL and IPL evaluated the anticipated sale of these assetsWPL currently expect to adopt this standard on January 1, 2019 and believe it did not represent a strategic shift that has, or will have, a major effect on their operational and financial results. As a result, the operating results of IPL’s Minnesota natural gas distribution assets have not been separately classified and reported as discontinued operations in Alliant Energy’s and IPL’s income statements. Alliant Energy and IPL are currently evaluating the impact of the newthis standard on IPL’s anticipated saletheir financial condition and results of its Minnesota electric distribution assetsoperations and currently do not expect the anticipated sale of these assets to qualify as discontinued operations under the new standard. Refer to Note 19 for details of IPL’s Minnesota natural gas distributionan increase in assets and liabilities classified as held for sale as of December 31, 2014.from recognizing operating leases on their balance sheets.


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(2)NOTE 2. REGULATORY MATTERS
Regulatory Assets - At December 31, regulatory assets were comprised of the following items (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Tax-related
$955.3
 
$829.7
 
$928.0
 
$798.6
 
$27.3
 
$31.1

$1,055.6
 
$987.7
 
$1,022.4
 
$958.2
 
$33.2
 
$29.5
Pension and OPEB costs570.2
 355.3
 287.9
 174.2
 282.3
 181.1
578.7
 579.5
 294.0
 298.1
 284.7
 281.4
AROs73.7
 65.7
 41.4
 36.7
 32.3
 29.0
105.9
 92.4
 64.3
 50.8
 41.6
 41.6
WPL’s EGUs retired early41.4
 45.0
 
 
 41.4
 45.0
Derivatives46.9
 21.1
 28.0
 5.9
 18.9
 15.2
30.7
 70.6
 10.0
 28.2
 20.7
 42.4
Emission allowances26.2
 26.9
 26.2
 26.9
 
 
Commodity cost recovery31.1
 2.0
 0.4
 0.7
 30.7
 1.3
6.0
 35.9
 0.3
 2.8
 5.7
 33.1
Emission allowances27.4
 30.0
 27.4
 30.0
 
 
Debt redemption costs16.1
 17.9
 10.9
 12.2
 5.2
 5.7
Environmental-related costs16.0
 25.0
 11.5
 21.0
 4.5
 4.0
Other47.0
 66.5
 22.4
 34.2
 24.6
 32.3
70.6
 70.6
 41.6
 37.6
 29.0
 33.0

$1,783.7
 
$1,413.2
 
$1,357.9
 
$1,113.5
 
$425.8
 
$299.7

$1,915.1
 
$1,908.6
 
$1,458.8
 
$1,402.6
 
$456.3
 
$506.0

A portion of the regulatory assets in the above table are not earning a return. These regulatory assets, are expected to be recovered from customers in future rates; however,but not the respective carrying costs of these regulatory assets, are not expected to be recovered from customers in future rates. At December 31, 20142016, IPL and WPL had $2644 million and $109 million, respectively, of regulatory assets representing past expenditures that were not earning a return. IPL’s regulatory assets that were not earning a return consisted primarily of emission allowances, debt redemption costs, and costs for clean air compliance projects and debt redemption costs.wind generation expansion projects. WPL’s regulatory assets that were not earning a return consisted primarily of amounts related to the wholesale portion of under-collected fuel-related costs, which is discussed in Note 1(g), and environmental-related costs. The other regulatory assets reported in the above table either earn a return or the cash has not yet been expended, in which case the assets are offset by liabilities that also do not incur a carrying cost.

Tax-related - IPL and WPL record regulatory assets for certain temporary differences (primarily related to utility property, plant and equipment at IPL) that result in a decrease in current rates charged to customers and an increase in future rates charged to customers based on the timing of income tax expense that is used to determine such rates. These temporary differences for IPL include the impacts of qualifying deductions for repairs expenditures, and allocation of mixed service costs, and Iowa accelerated tax depreciation, which all contribute to lower current income tax expense during the first part of an asset’s useful life and higher current tax expense during the last part of an asset’s useful life. These regulatory assets will be recovered from customers in the future when these temporary differences reverse resulting in additional current income tax expense used to determine customers’ rates. During 2014,2016, Alliant Energy’s and IPL’s tax-related regulatory assets increased primarily due to property-related differences for qualifying repair expenditures, allocation of mixed service costs and tax accounting method changes in 2014 for cost of removal expenditures and repair expenditures for electric generation property at IPL. The increase related to the tax accounting method changes was offset by increased regulatory liabilities as discussed below in “IPL’s tax benefit riders.”expenditures.

Pension and other postretirement benefits costs - The IUB and the PSCW have authorized IPL and WPL to record the retail portion of their respective previously unrecognized net actuarial gains and losses, and prior service costs and credits, as regulatory assets in lieu of AOCL on the balance sheets, as these amounts are expected to be recovered in future rates. IPL and WPL also recognize the wholesale portion of their previously unrecognized net actuarial gains and losses, and prior service costs and credits, as regulatory assets on the balance sheets because these costsamounts are expected to be recovered in rates in future periods under the formula rate structure. These regulatory assets will be increased or decreased as the net actuarial gains or losses, and prior service costs or credits, are subsequently amortized and recognized as a component of net periodic benefit costs. Regulatory assets are also increased or decreased as a result of the annual defined benefit plan measurement process. During 2014, Alliant Energy’s, IPL’s and WPL’s pension and OPEB costs regulatory assets increased due to an increase in unrecognized net actuarial losses caused by lower discount rates and a change in life expectancy assumptions used in the annual defined benefit plan measurement process as of December 31, 2014 compared to December 31, 2013.

Pension and OPEB costs are included within the recoverable cost of service component of rates charged to IPL’s and WPL’s customers. The recoverable costs included in customers’ rates are based upon pension and OPEB costs determined in accordance with GAAP and are calculated using different methods for the variousIPL’s and WPL’s respective regulatory jurisdictions in which IPL and WPL operate.jurisdictions. The IUB authorized IPL in its 2009 test yearTest Year Iowa retail electric rate case order to recover from its retail electric customers in Iowa an allocated portion of annual costs equal to a two-year simple average of actual costs incurred during its test year (2009)2009 Test Year and an estimate of costs for its forward-looking post-test yearpost-Test Year (2010). The PSCW has authorized WPL

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in its Wisconsin retail rate cases for the 2013/2014 and 2015/2016 test periods to recover from its retail electric and gas retail customers an estimated allocated portion of annual costs equal to the costs expected to be incurred during the respectiveeach test year periods.period. IPL and WPL are authorized to recover from their wholesale customers an allocated portion of actual pension costs incurred each year. In accordance withyear through FERC-approved formula rates, any over- or under-collection of these pension costs each year are refunded to or recovered from customers through subsequent changes to wholesale customer rates. Refer to Note 12(a) for additional details regarding pension and OPEB costs.

AROs - Alliant Energy, IPL and WPL believe it is probable that any differences between expenses accrued for legal AROs related to their regulated operations and expenses recovered currently in rates will be recoverable in future rates, and are deferring the differences as regulatory assets. Refer to Note 13 for additional details of AROs.

WPL’s electric generating units retired early - In December 2015, WPL retired Nelson Dewey Units 1 and 2 and Edgewater Unit 3. WPL received approval from the PSCW and FERC to reclassify the remaining net book value of these EGUs from property, plant and equipment to a regulatory asset on Alliant Energy’s and WPL’s balance sheets. The remaining net book value is included in WPL’s rate base and WPL is earning a return on the outstanding balance. WPL is currently recovering the remaining net book value of these EGUs from both its retail and wholesale customers over a 10-year period beginning January 1, 2013 pursuant to PSCW and FERC orders.

Derivatives - In accordance with IPL’s and WPL’s fuel and natural gas recovery mechanisms, prudently incurred costs from derivative instruments are recoverable from customers in the future after any losses are realized, and gains from derivative instruments are refundable to customers in the future after any gains are realized. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities/assets resulted in comparable changes to regulatory assets/liabilities on the balance sheets. Refer to Note 15 for additional details of derivative assets and derivative liabilities.

Commodity cost recovery - Refer to Note 1(g) for additional details of IPL’s and WPL’s cost recovery mechanisms, and “WPL’s Retail Fuel-related Rate Filing (2014 Test Year)” below for discussion of the increase in Alliant Energy’s and WPL’s commodity cost recovery regulatory assets in 2014.

Emission allowances - IPL entered into forward contracts in 2007 to purchase SO2 emission allowances with vintage years of 2014 through 2017 from various counterparties for $34 million to meet future CAIR emission reduction standards. Any SO2 emission allowances acquired under these forward contracts could be used to meet requirements under the existing Acid Rain program regulations or the more stringent CAIR emission reduction standards but are not eligible to be used for compliance requirements under CSAPR. In 2011, the EPA issued CSAPR to replace CAIR with an anticipated effective date in 2012. As a result of the issuance of CSAPR, Alliant Energy and IPL concluded in 2011 that the allowances to be acquired under these forward contracts would not be needed by IPL to comply with expected environmental regulations in the future. The value of these allowances was nominal, which was significantly below the $34 million contract price for these allowances. As a result, Alliant Energy and IPL recognized charges of $34 millionhave recorded a regulatory asset for theseamounts paid under the forward contracts, in 2011 with an offsettingas well as for the remaining obligation recorded in other liabilities. Alliant Energy and IPL concluded that $30 millionunder the forward contracts as a result of concluding the charges areamount is probable of recovery from IPL’s customers, and therefore, were recorded to regulatory assets in 2011. The current value of these allowances continues to be nominal and significantly below the $34 million contract price for these allowances. Alliant Energy and IPL believe the unamortized balance of this regulatory asset is probable of future recovery.customers.

Debt redemption costsCommodity cost recovery - For debt retired early with no subsequent re-issuance, IPL and WPL defer any debt repayment premiums and unamortized debt issuance costs and discounts as regulatory assets. These regulatory assets are amortized over the remaining original life of the debt retired early. Debt repayment premiums and other losses resulting from the refinancing of debt by IPL and WPL are deferred as regulatory assets and amortized over the life of the new debt issued.

Environmental-related costs - The IUB has permitted IPL to recover prudently incurred costs by allowing a representative level of MGP costs in the recoverable cost of service component of rates, as determined in its most recent retail gas rate case. Under the current rate-making treatment approved by the PSCW, the MGP expenditures of WPL are deferred and collected from retail gas customers over a five-year period after new rates are implemented. Regulatory assets recorded by IPL and WPL reflect the probable future rate recovery of MGP expenditures. Refer to Note 16(e)1(g) for additional details of environmental-related MGP costs.IPL’s and WPL’s cost recovery mechanisms.

Other - Alliant Energy, IPL and WPL assess whether IPL’s and WPL’s regulatory assets are probable of future recovery by considering factors such as applicable regulations, recent orders by the applicable regulatory agencies, historical treatment of similar costs by the applicable regulatory agencies and regulatory environment changes. Based on these assessments, Alliant Energy, IPL and WPL believe the regulatory assets recognized as of December 31, 20142016 in the above table are probable of future recovery. However, no assurance can be made that IPL and WPL will recover all of these regulatory assets in future rates. If future recovery of a regulatory asset ceases to be probable, the regulatory asset will be charged to expense in the period in whichthe likelihood of future recovery ceases to beis less than probable.

Based on the PSCW’s July 2012 order related to WPL’s 2013/2014 test period Wisconsin retail electric and gas rate case, WPL was authorized to recover previously incurred costs associated with the acquisition of a 25% ownership interest in Edgewater Unit 5 and proposed emission controls projects. As a result, Alliant Energy and WPL recorded a $5 million

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increase to regulatory assets, and a $5 million credit to “Utility - Other operation and maintenance” in their income statements in 2012.

Regulatory Liabilities - At December 31, regulatory liabilities were comprised of the following items (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Cost of removal obligations
$421.7
 
$418.9
 
$279.1
 
$277.7
 
$142.6
 
$141.2

$411.6
 
$406.0
 
$269.4
 
$260.4
 
$142.2
 
$145.6
IPL’s tax benefit riders243.0
 265.4
 243.0
 265.4
 
 
83.5
 159.2
 83.5
 159.2
 
 
Electric transmission cost recovery72.0
 43.5
 35.7
 21.9
 36.3
 21.6
Derivatives31.5
 8.5
 12.1
 6.7
 19.4
 1.8
Commodity cost recovery30.8
 37.6
 17.8
 23.5
 13.0
 14.1
Energy efficiency cost recovery64.3
 52.7
 
 9.3
 64.3
 43.4
20.5
 48.3
 
 
 20.5
 48.3
IPL’s electric transmission cost recovery19.4
 14.6
 19.4
 14.6
 
 
Commodity cost recovery15.4
 7.5
 15.1
 5.5
 0.3
 2.0
IPL’s electric transmission assets sale11.3
 21.6
 11.3
 21.6
 
 
Other46.1
 40.8
 15.6
 20.8
 30.5
 20.0
31.1
 34.6
 12.3
 17.5
 18.8
 17.1

$821.2
 
$821.5
 
$583.5
 
$614.9
 
$237.7
 
$206.6

$681.0
 
$737.7
 
$430.8
 
$489.2
 
$250.2
 
$248.5

Regulatory liabilities related to cost of removal obligations, to the extent expensed through depreciation rates, reduce rate base. A significant portion of the remaining regulatory liabilities are not used to reduce rate base in the revenue requirement calculations utilized in IPL’s and WPL’s respective rate proceedings.

Cost of removal obligations - Alliant Energy, IPL and WPL collect in rates future removal costs for many assets that do not have associated legal AROs. Alliant Energy, IPL and WPL record a regulatory liability for the estimated amounts they have collected in rates for these future removal costs lessand reduce the regulatory liability for amounts spent on removal activities.


IPL’s tax benefit riders - IPL’sThe IUB has approved electric and gas tax benefit riders proposed by IPL, which utilize regulatory liabilities to credit bills of IPL’s Iowa retail electric and gas customers to help offset the impact of rate increases on such customers. TheseAlliant Energy and IPL recognize an offsetting reduction to income tax expense for the after-tax amounts credited to such customers, resulting in no impact to their net income from the electric and gas tax benefit riders. The tax benefit riders regulatory liabilities are related to tax benefits from tax accounting method changes for repairs expenditures, allocation of mixed service costs, allocation of insurance proceeds from floods in 2008, and cost of removal expenditures. In 2014,2016, Alliant Energy’s and IPL’s “IPL’s tax benefit riders” regulatory liabilities decreased by ($22)$76 million as follows (in millions):
Electric tax benefit rider credits
($8564)
Gas tax benefit rider credits(12)
Tax accounting method changes75
 
($2276)

In 2013, the U.S. Department of the Treasury issued tangible property regulations clarifying the tax treatment of costs incurred to acquire, maintain or improve tangible property and to retire and remove depreciable property. The regulations clarified the ability to deduct cost of removal expenditures on partial dispositions of assets. In 2014, the IRS issued implementation guidance related to these tangible property regulations, which allowed companies to file a tax accounting method change to deduct cost of removal expenditures on partial dispositions that were previously capitalized. In 2014, Alliant Energy, IPL and WPL implemented this tax accounting method change, which will result in the inclusion of additional tax deductions on Alliant Energy’s U.S. federal income tax return for the calendar year 2014. In 2013, the IRS also issued guidance that clarified acceptable units of property to be used when assessing whether costs incurred for electric generation projects may be deducted as repair expenditures or if they must be capitalized. After assessing the guidance, Alliant Energy, IPL and WPL decided in 2014 to implement the new units of property by filing a tax accounting method change as part of Alliant Energy’s U.S. federal income tax return for the calendar year 2013. IPL currently anticipates refunding its related current tax benefits from these two tax accounting method changes to its Iowa retail electric and gas customers in the future, and as a result, Alliant Energy and IPL recorded an increase of $75 million to IPL’s tax benefit riders regulatory liabilities and IPL’s tax-related regulatory assets in 2014.

Electric tax benefit rider - The IUB has approved an electric tax benefit rider proposed by IPL, which utilizes regulatory liabilities to credit bills of Iowa retail electric customers beginning in 2011 to help offset the impact of rate increases on such customers. Alliant Energy and IPL recognize an offsetting reduction to income tax expense for the after-tax amounts credited to IPL’s retail electric customers’ bills in Iowa, resulting in no impact to Alliant Energy’s and IPL’s net income from the electric tax benefit rider as follows (in millions):

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 2014 2013 2012
Credit to IPL’s Iowa retail electric customers’ bills with reduction to electric revenues
$85
 
$79
 
$83
Income tax benefit resulting from decreased taxable income caused by credits35
 33
 35
Income tax benefit representing tax benefits realized from electric tax benefit rider50
 46
 48

In December 2014,2016, the IUB issued an order authorizing $75authorized $68 million and $7 million of regulatory liabilities from tax benefits to be credited to IPL’s retail electric and gas customers’ bills in Iowa during 20152017 through the electric and gas tax benefit rider.riders, respectively. Any remaining tax benefit rider regulatory liabilities are currently expected to be credited to IPL’s retail electric and gas customers’ bills in the future, subject to final review by the IUB.

In 2013, theElectric tax benefit rider - Details for IPL’s electric tax benefit rider are as follows (in millions):
 2016 2015 2014
Credit to IPL’s Iowa retail electric customers’ bills with reduction to electric revenues (based on customers’ KWh usage)
$64
 
$72
 
$85
Income tax benefit resulting from decreased taxable income caused by credits27
 30
 35
Income tax benefit representing tax benefits realized from electric tax benefit rider37
 42
 50

The IUB authorized IPL to reduce the electric tax benefit rider billing credits on customers’ bills infor 2013 and 2014through 2016 to recognize the revenue requirement impact of the changes in tax accounting methods.methods related to tangible property and mixed service costs. The revenue requirement adjustment resulted in increases to electric revenues in Alliant Energy’s and IPL’s income statements and was recognized through the energy adjustment clause as a reduction of the credits on IPL’s Iowa retail electric customers’ bills from the electric tax benefit rider as follows (in millions):
 2014 2013
Revenue requirement adjustment
$15
 
$24

In December 2014, the IUB authorized IPL to reduce the $75 million of billing credits on customers’ bills by $15 million in 2015 to recognize the revenue requirement impact of the changes in tax accounting methods.
 2016 2015 2014
Revenue requirement adjustment
$14
 
$14
 
$15

Gas tax benefit rider - The IUB has approved aDetails for IPL’s gas tax benefit rider proposed by IPL, which utilizes approximately $12 million of regulatory liabilities annually to credit bills of Iowa retail gas customers beginning in January 2013 through December 2015 to help offset the impact of rate increases on such customers. Alliant Energy and IPL utilized gas tax benefit rider-related regulatory liabilities to credit IPL’s Iowa retail gas customers’ billsare as follows (in millions):
2014 20132016 2015 2014
Credit to IPL’s Iowa retail gas customers’ bills with reduction to gas revenues
$12
 
$11
Credit to IPL’s Iowa retail gas customers’ bills with reduction to gas revenues (based on a fixed amount per day)
$12
 
$12
 
$12
Income tax benefit resulting from decreased taxable income caused by credits5
 4
5
 5
 5
Income tax benefit representing tax benefits realized from gas tax benefit rider7
 7
7
 7
 7

Electric transmission cost recovery - Refer to Note 1(g) for additional details of IPL’s and WPL’s electric transmission service cost recovery mechanisms.

Commodity cost recovery - Refer to Note 111(g) for additional details regardingof IPL’s tax benefit riders.and WPL’s commodity cost recovery mechanisms.

Energy efficiency cost recovery - WPL and IPL collect revenues from their customers to offset certain expenditures incurred by WPL and IPLthey each incur for energy efficiency programs, including state mandated programs and Shared Savings programs. Differences between forecasted costs used to set rates and actual costs for these programs are deferred as a regulatory asset or regulatory liability. The July 2012 PSCWPSCW’s order for WPL’s 2013/2014 test period2015/2016 Test Period electric and gas base rate case authorized higher energy efficiency cost recovery amortizations for 2014,2016, which contributed to the increasedecrease in Alliant Energy’s and WPL’s “Energy efficiency cost recovery” regulatory liabilities.

IPL’s electric transmission cost recovery - Refer to Note 1(g) for additional details of IPL’s electric transmission service cost recovery mechanism.

Commodity cost recovery - Refer to Note 1(g) for additional details of IPL’s and WPL’s commodity cost recovery mechanisms.

IPL’s electric transmission assets sale - In 2007, IPL completed the sale of its electric transmission assets to ITC and recognized a gain based on the terms of the agreement. Upon closing of the sale, IPL established a regulatory liability pursuant to conditions established by the IUB when it allowed the transaction to proceed. The regulatory liability represented the present value of IPL’s obligation to refund to its customers payments beginning in the year IPL’s customers experience an increase in rates related to the transmission charges assessed by ITC. The regulatory liability accrues interest at the monthly average U.S. Treasury rate for three-year maturities.

In 2009, the IUB issued an order authorizing IPL to use a portion of this regulatory liability to reduce Iowa retail electric customers’ rates by $12 million for the period from July 2009 through February 2010 with billing credits included in the monthly energy adjustment clause. In 2010, the IUB issued an order authorizing IPL to use a portion of this regulatory liability to offset electric transmission service costs expected to be billed to IPL by ITC in 2010 related to ITC’s 2008 transmission revenue adjustment. IPL utilized $41 million of this regulatory liability over a five-year period ending December 2014 to offset the Iowa retail portion of transmission costs billed to IPL by ITC in 2010 related to ITC’s 2008

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transmission revenue adjustment. As a result, IPL amortized $8 million of this regulatory liability annually, with an equal and offsetting amount of amortization for IPL’s regulatory asset related to electric transmission service costs.

Utility Rate Cases -
WPL’s Wisconsin Retail Electric and Gas Rate Case (2017/2018 Test Period) - In December 2016, WPL received an order from the PSCW authorizing WPL to implement increases in annual retail electric and gas base rates of $9 million and $9 million, respectively, effective January 1, 2017 followed by a freeze of such rates through the end of 2018. The key drivers for the electric and gas base rate increases are recovery of the costs for environmental controls projects at Edgewater

and Columbia, and investments in electric and gas distribution systems, including expansion of natural gas pipeline infrastructure. The filing also included utilization of amounts that WPL previously over-recovered from its customers for energy efficiency cost recovery and electric transmission cost recovery, as well as amounts deferred under the return on common equity sharing mechanism for the 2013/2014 Test Period to reduce the requested base rate increases. The order included provisions that require WPL to defer a portion of its earnings if its annual regulatory return on common equity exceeds certain levels in 2017 or 2018.

WPL’s Wisconsin Retail Electric and Gas Rate Case (2015/2016 Test Period) - In July 2014, WPL received an order from the PSCW authorizing WPL to maintain retail electric base rates at their then current levels through the end of 2016. The retail electric base rate case included a return of and a return onof costs for emissionenvironmental controls projects, at Columbia Units 1 and 2 and Edgewater Unit 5, generation performance and reliability improvements, at Columbia Units 1 and 2, other ongoing capital expenditures and an increase in electric transmission service expense. The additional revenue requirement for these cost increases was offset by the impact of changes in the amortization of regulatory liabilities associated with energy efficiency cost recoveries and increased sales volumes. The order also authorizesauthorized WPL to implement a $5 million decrease in annual base rates for its retail gas customers effective January 1, 2015 followed by a freeze of such gas base rates through the end of 2016. The order included provisions that requirerequired WPL to defer a portion of its earnings if its annual regulatory return on common equity exceedsexceeded certain levels duringin 2015 or 2016. As of December 31, 2016, Alliant Energy and allows WPL to request a changedeferred $6 million of WPL’s 2016 earnings for these provisions, which is included in retail base rates during this period if its annual“Other” in Alliant Energy’s and WPL’s regulatory return on common equity falls below a certain level.liabilities tables above.

WPL’s Wisconsin Retail Electric and Gas Rate Case (2013/2014 Test Period) - - In July 2012, WPL received anThe PSCW’s order from the PSCW authorizing WPL to implement a decrease in annual retailfor WPL’s 2013/2014 Test Period electric and gas base rates of $13 million effective January 1, 2013, followed by a freeze of such gas base rates through the end of 2014. The order also authorized WPL to maintain retail electric base rates at their current levels through the end of 2014. The orderrate case included a provisionprovisions that required WPL to defer a portion of its earnings if its annual regulatory return on common equity exceedsexceeded certain levels during 2013 or 2014. As of December 31, 2014,2016, Alliant Energy and WPL deferred $9$6 million of WPL’s 2013 and 2014 earnings for these provisions, which is included in “Other” in Alliant Energy’s and WPL’s regulatory liabilities tables above.

IPL’s Iowa Retail Gas Rate Case (2011 Test Year) - In May 2012, IPL filed a request with These deferred earnings will be returned to customers as an offset to revenue requirements in 2017 and 2018 as authorized by the IUB to increase annual rates for its Iowa retail gas customers based on a 2011 historical test year as adjusted for certain known and measurable changes occurring up to 12 months after the commencement of the proceeding. IPL’s request included a proposal to utilize regulatory liabilities to credit bills of Iowa retail gas customers to help mitigate the impact of the proposed final rate increase on such customers. IPL proposed to reduce customer bills utilizing a gas tax benefit rider over a three-year period by approximately $36 million in aggregate. In conjunction with the filing, IPL implemented an interim retail gas rate increase of $9 million, or approximately 3%, on an annual basis, effective June 4, 2012, without regulatory review and subject to refund pending determination of final rates from the request. In 2012, Alliant Energy and IPL recorded $5 million in gas revenues from IPL’s Iowa retail gas customers related to the interim retail gas rate increase. In November 2012, the IUB approved a settlement agreement related to IPL’s request, resulting in a final increase in annual rates for IPL’s Iowa retail gas customers of $11 million, or approximately 4%, effective January 10, 2013. The parties to the settlement agreement and the IUB also agreed to IPL’s proposed gas tax benefit rider. Refer to “Regulatory Liabilities” above for additional details on IPL’s gas tax benefit rider.PSCW.

IPL’s Iowa Retail Electric Rate Settlement Agreement - In September 2014, theThe IUB approved a settlement agreement in 2014 related to rates charged to IPL’s Iowa retail electric customers. The settlement agreement extendsextended IPL’s Iowa retail electric base rates authorized in its 2009 test yearTest Year rate case through 2016 and providesprovided targeted retail electric customer billing credits of $105 million in aggregate, beginning May 2014aggregate. IPL recorded such billing credits as follows (in millions):
 2014 2015 2016
Billing credits to reduce retail electric customers’ bills
$70
 
$25
 
$10

In 2014, IPL recorded $72 million of such retail electric customer billing credits. IPL will make adjustments to future billing credits to provide aggregate retail electric customer billing credits of $105 million in aggregate.
 2016 2015 2014
Billing credits to reduce retail electric customers’ bills
$9
 
$24
 
$72

WPL’s Retail Fuel-related Rate Filing (2015 Test Year)Filings - - In December 2014, WPL received an order from theThe PSCW authorizing anauthorized annual retail electric rate increase of $39 million, or approximately 4%, effective January 1, 2015. The increase includes $39 million ofincreases for WPL in 2014, 2015 and 2016, resulting from anticipated increases in retail electric fuel-related costs in 2015 attributable to $25 million for higher retail electric fuel-related costs per MWh anticipated in 2015 and $14 million from the impact of increased sales volumes approved in the retail electric base rate case for 2015. WPL’s 2015 fuel-related costs will be subject to deferral if they fall outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs. Deferral of under-collections are reduced to the extent WPL’s actual return on common equity exceeds the most recently authorized return on common equity.


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WPL’s Retail Fuel-related Rate Filing (2014 Test Year) - In 2013, WPL received an order from the PSCW authorizing an annual retail electric rate increase of $19 million, or approximately 2%, effective January 1, 2014 to reflect anticipated increases in retail electric fuel-related costs in 2014 compared to the fuel-related cost estimates used to determine rates for 2013. WPL’s 2014 fuel-related costs were subject to deferral if they fell outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs.during such periods. Retail fuel-related costs incurred by WPL through December 31,in 2015 and 2016 were lower than fuel-related costs used to determine rates for such period resulting in an over-collection of fuel-related costs, and retail fuel-related costs incurred by WPL in 2014 were higher than fuel-related costs used to determine rates for such period resulting in an under-collection of fuel-related costs for 2014 of $33 million (including $28 million outside the approved range for 2014). As of December 31, 2014, Alliant Energy and WPL recorded $28 million in “Regulatory assets” on their balance sheets for the fuel-related costs incurred in 2014 that fell outside the PSCW approved bandwidth. The $28 million of deferred fuel-related costs is included in “Commodity cost recovery” in Alliant Energy’s and WPL’s regulatory assets tables above. Beginning in 2015, the regulatory asset will accrue interest at WPL’s PSCW authorized short-term debt rate. WPL currently expects to file a fuel reconciliation application with the PSCW in the first quarter of 2015 to seek recovery of these deferred fuel-related costs.

WPL’s Retail Fuel-related Rate Filing (2013 Test Year) - In 2012, WPL received an order from the PSCW authorizing an annual retail electric rate decrease of $29 million, or approximately 3%, effective January 1, 2013 to reflect anticipated decreases in retail electric fuel-related costs in 2013 compared to the fuel-related cost estimates used to determine rates for 2012. WPL’s 2013 These fuel-related costs were subject to deferral ifsince they fellwere outside an annual bandwidth of plus or minus 2% of the approved respective annual forecasted fuel-related costs. RetailDetails on these rate increases, as well as amounts WPL deferred for the over-collected (included in “Commodity cost recovery” regulatory liabilities) or under-collected (included in “Commodity cost recovery” regulatory assets) fuel-related costs incurred by WPL for 2013 did not fall outside of the bandwidth.

WPL’s Retail Fuel-related Rate Filing (2012 Test Year) - In 2011, WPL received an order from the PSCW authorizing an annual retail electric rate increase of $4 million, effective January 1, 2012 to reflect anticipated increases in retail fuel-related costs in 2012 compared to the fuel-related cost estimates used to determine rates for 2011. The 2012 fuel-related costs were subject to deferral if they fell outside an annual bandwidth of plus or minus 2% of the approved annual forecasted fuel-related costs. Retail fuel-related costs incurred by WPL in 2012 were lower than retail fuel-related costs used to determine rates for such period resulting in an over-collection of fuel-related costs for 2012 of approximately $17 million (including $11 million outside the approved range for 2012). In 2013, WPL received an order from the PSCW to refund $12 million, including interest, to its retail electric customers for these over-collections, which WPL completedare as follows (dollars in 2013.millions):
  Retail Electric Deferral of Over (Under) Timing of Refunds To or
Year Rate Increase Collected Fuel-related Costs Collections From Customers
2016 
$7
 1% 
$9
 Pending
2015 39
 4% 10
 2016
2014 19
 2% (28) 2016

(3)
NOTE 3. PROPERTY, PLANT AND EQUIPMENT
At December 31, details of property, plant and equipment on the balance sheets were as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Utility:                      
Electric plant:                      
In service:           
Generation (a)
$5,463.0
 
$4,792.0
 
$2,872.4
 
$2,513.2
 
$2,590.6
 
$2,278.8
Distribution4,435.4
 4,179.6
 2,471.7
 2,311.2
 1,963.7
 1,868.4
Other309.1
 286.3
 215.5
 210.5
 93.6
 75.8
Anticipated to be retired early (b)157.6
 157.8
 
 
 157.6
 157.8
Generation in service
$5,866.9
 
$5,643.7
 
$2,916.8
 
$3,011.6
 
$2,950.1
 
$2,632.1
Distribution in service4,739.2
 4,489.9
 2,589.3
 2,447.9
 2,149.9
 2,042.0
Other in service329.1
 311.3
 223.5
 212.2
 105.6
 99.1
Anticipated to be retired early (a)108.3
 
 108.3
 
 
 
Total electric plant10,365.1
 9,415.7
 5,559.6
 5,034.9
 4,805.5
 4,380.8
11,043.5
 10,444.9
 5,837.9
 5,671.7
 5,205.6
 4,773.2
Gas plant in service946.2
 909.9
 474.0
 456.8
 472.2
 453.1
1,107.6
 1,018.3
 556.7
 513.6
 550.9
 504.7
Other plant in service539.3
 547.9
 298.8
 302.8
 240.5
 245.1
549.3
 530.6
 313.0
 296.0
 236.3
 234.6
Accumulated depreciation(3,923.1) (3,726.2) (2,124.5) (2,025.3) (1,798.6) (1,700.9)(4,135.7) (3,939.6) (2,258.3) (2,152.8) (1,877.4) (1,786.8)
Net plant7,927.5
 7,147.3
 4,207.9
 3,769.2
 3,719.6
 3,378.1
8,564.7
 8,054.2
 4,449.3
 4,328.5
 4,115.4
 3,725.7
Leased Sheboygan Falls Energy Facility, net (c)
 
 
 
 64.7
 70.9
Leased Sheboygan Falls Energy Facility, net (b)
 
 
 
 52.4
 58.6
Construction work in progress479.1
 677.9
 325.0
 346.4
 154.1
 331.5
1,226.8
 897.5
 968.1
 578.2
 258.7
 319.3
Other, net22.3
 22.3
 21.8
 21.2
 0.5
 1.1
18.4
 18.5
 18.2
 18.4
 0.2
 0.1
Total utility8,428.9
 7,847.5
 4,554.7
 4,136.8
 3,938.9
 3,781.6
9,809.9
 8,970.2
 5,435.6
 4,925.1
 4,426.7
 4,103.7
Non-regulated and other:                      
Non-regulated Generation, net (d)240.1
 249.4
 
 
 
 
Corporate Services and other, net (e)269.4
 229.6
 
 
 
 
Non-regulated Generation, net (c)135.0
 229.3
 
 
 
 
Corporate Services and other, net (d)334.3
 319.6
 
 
 
 
Total non-regulated and other509.5
 479.0
 
 
 
 
469.3
 548.9
 
 
 
 
Total property, plant and equipment
$8,938.4
 
$8,326.5
 
$4,554.7
 
$4,136.8
 
$3,938.9
 
$3,781.6

$10,279.2
 
$9,519.1
 
$5,435.6
 
$4,925.1
 
$4,426.7
 
$4,103.7


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(a)Includes various emission controls projects placedIn 2016, IPL received approval from MISO to retire Sutherland Unit 3 and currently anticipates retiring this EGU by June 30, 2017. The recovery of the remaining net book value of this EGU is expected to be addressed in serviceIPL’s next retail electric base rate case, which is currently expected to be filed in 2014, which are discussed in “Emission Controls Projects” below.the second quarter of 2017.
(b)In 2013,
Less accumulated amortization of $71.4 million and $65.2 million for WPL received approval from MISO to retire Edgewater Unit 3, and Nelson Dewey Units 1 and 2. WPL currently anticipates retiring these EGUs by as of December 31, 2016 and 2015, contingent on completion of transmission network upgrades needed for system reliability.respectively. The Sheboygan Falls Energy Facility is eliminated from WPL upon consolidation and is recoveringincluded in the remaining net book value of these EGUs over a 10-year period beginning January 1, 2013 pursuant to a May 2012 PSCW order.“Non-regulated Generation, net” line within Alliant Energy’s consolidated property, plant and equipment.
(c)
Less accumulated amortizationdepreciation of $59.1$46.5 million and $52.9$59.0 million for WPLAlliant Energy as of December 31, 20142016 and 2013,2015, respectively.
(d)
Less accumulated depreciation of $49.5$272.0 million and $40.0$252.9 million for Alliant Energy as of December 31, 20142016 and 2013, respectively.
(e)
Less accumulated depreciation of $229.1 million and $214.2 million for Alliant Energy as of December 31, 2014 and 2013,2015, respectively.

Utility -
EmissionEnvironmental Controls ProjectsProject -Various environmental controls projects to install scrubbers and baghouses at certain EGUs have been completed or are currently in progress. The scrubbers and baghouses reduce SO2 and mercury emissions at the EGUs and are expected to help meet requirements under the MATS Rule and CSAPR.

IPL’s George NealWPL’s Edgewater Unit 35 - Construction of a scrubber and baghouse at George NealEdgewater Unit 35 began in 20112014 and was completed in 2014,2016, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant - Generation”Generation in the above table for Alliant Energy and IPL in 2014. IPL owns a 28% interest in George Neal Unit 3. As of December 31, 2014, the capitalized project costs consisted of capital expenditures of $60 million and AFUDC of $4 million for IPL’s allocated portion of the George Neal Unit 3 scrubber and baghouse.

IPL’s Ottumwa Unit 1 - Construction of a scrubber and baghouse at Ottumwa Unit 1 began in 2012 and was completed in 2014, which resulted in a transfer of the capitalized projects costs from “Construction work in progress” to “Electric plant - Generation” in the above table for Alliant Energy and IPL in 2014. IPL owns a 48% interest in Ottumwa Unit 1. As of December 31, 2014, the capitalized project costs consisted of capitalized expenditures of $154 million and AFUDC of $21 million for IPL’s allocated portion of the Ottumwa Unit 1 scrubber and baghouse.

WPL’s Columbia Units 1 and 2 - Construction of scrubbers and baghouses at Columbia Units 1 and 2 began in 2012 and was completed in 2014, which resulted in a transfer of the capitalized project costs from “Construction work in progress” to “Electric plant - Generation”service” in the above table for Alliant Energy and WPL in 2014. WPL owns 46.2% interest in Columbia Units 1 and 2. As of December 31, 2014, the capitalized project costs consisted of capital expenditures of $272 million and AFUDC of $15 million for WPL’s allocated portion of the Columbia Units 1 and 2 scrubbers and baghouses.

WPL’s Edgewater Unit 5 - WPL is currently installing a scrubber and baghouse at Edgewater Unit 5. Construction began in 2014 and is expected to be completed in 2016. As of December 31, 20142016, Alliant Energy and WPL recorded2015, the capitalized expenditures of $90 million and AFUDC of $3 millionproject costs for the scrubber and baghouse in “Construction work in progress” inconsisted of capitalized expenditures of $225 million and CWIP of $190 million, and AFUDC of $12 million and $8 million, respectively, for the above table for Alliant Energyscrubber and WPL.baghouse. The scrubber and baghouse reduce SO2 and mercury emissions at the EGU and are expected to help meet requirements under CSAPR.

Natural Gas-Fired Generation ProjectProjects -
IPL’s Marshalltown Generating Station - IPL is currently constructing Marshalltown, an approximate 650 MW natural gas-fired combined-cycle EGU. Construction began in 2014 and is expected to be completed in April 2017. As of December 31, 20142016, and 2015, Alliant Energy and IPL recorded capitalized expenditures for CWIP of $188$612 million and $453 million, and AFUDC of $4$68 million and $24 million, respectively, for Marshalltown in “Construction work in progress” in the above table for Alliant Energy and IPL.

Anticipated WPL’s Riverside Expansion - WPL is currently constructing the Riverside expansion, an approximate 730 MW natural gas-fired combined-cycle EGU. Construction began in 2016 and is expected to be completed in early 2020. As of December 31, 2016 and 2015, Alliant Energy and WPL recorded capitalized expenditures for CWIP of $81 million and $2 million, and AFUDC of $2 million and $0, respectively, for the Riverside expansion in “Construction work in progress” in the above table for Alliant Energy and WPL. These capital expenditures exclude any potential impacts from the intent to exercise purchase options by certain WPL electric cooperatives for a partial ownership interest in the Riverside expansion.

Wind Generation -
IPL’s Expansion of Wind Generation - IPL currently plans to add wind generation to its resources portfolio. In 2016, IPL entered into a turbine supply agreement and made progress payments for a portion of the wind turbines in such agreement in order to qualify for the full level of production tax credits for this new wind generation. IPL anticipates placing certain of the additional wind generation in service in 2019 and 2020. As of December 31, 2016, Alliant Energy and IPL recorded capitalized expenditures for CWIP of $102 million and AFUDC of $1 million for this expansion of wind generation in “Construction work in progress” in the above table for Alliant Energy and IPL.

Sales of IPL’s Minnesota Electric and Natural Gas Distribution Assets - In September 2013,2015, IPL signedcompleted the sale of its Minnesota natural gas distribution assets (primarily related to property, plant and equipment) and received proceeds of $11 million and a definitive agreement to sellpromissory note of $2 million. In 2015, IPL completed the sale of its Minnesota electric distribution assets (primarily related to property, plant and equipment) to Southern Minnesota Energy Cooperative, a combined group of various neighboring electric cooperatives. Also in September 2013, IPL signed a definitive agreement to sell its Minnesotacooperatives, and received proceeds of $129 million. The proceeds from the natural gas distribution assets to Minnesota Energy Resources Corporation, a subsidiary of Integrys Energy Group, Inc. Proceedswere used for general corporate purposes and the proceeds from the electric distribution assets were used to reduce cash amounts received from IPL’s sales of accounts receivable program. The premium received over the book value of the property, plant and equipment sold was more than offset by a reduction in tax-related regulatory assets associated with the distribution assets. As a result, Alliant Energy and IPL recorded pre-tax charges of $11 million and $3 million for the Minnesota electric and natural gas distribution assets, which approximate the carrying value of such assets, are expected to be approximately $130 millionasset transactions, respectively, in “Other operation and $10 million, respectively, subject to customary closing adjustments. The proceeds are expected to reduce Alliant Energy’s and IPL’s future financing requirements. In December 2014, the MPUC issued an order approving the proposed sale of IPL’s Minnesota natural gas distribution assets. Pending receipt of remaining regulatory approvals and various other contingencies, the natural gas and electric transactions are currently expected to be concludedmaintenance” in 2015.


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The sales price of the assets expected to be sold, which primarily consist of property, plant and equipment, and working capital items, is not expected to resulttheir income statements in a material gain or loss. As of December 31, 2014, IPL’s assets and liabilities included in the electric sale agreement did not meet the criteria to be classified as held for sale due to uncertainties in the regulatory approval process that existed on such date. Refer to Notes 1(p) and 19 for further discussion of the natural gas distribution assets, which qualified as held for sale as of December 31, 2014.2015.

The electric distribution asset sales agreement includes a wholesale power supply agreement between IPL and Southern Minnesota Energy Cooperative, which is subject towas approved by FERC approval.in 2015 and became effective upon the sale of IPL’s Minnesota electric distribution assets. The wholesale power supply agreement contains a five-year termination notice, which may not be given until the fifth anniversary of the effective date of the agreement, resulting in a minimum term of 10 years. The agreement remains in effect indefinitely, unless notice to terminate is provided by either party. This wholesale power supply agreement includes standardized pricing mechanisms that are detailed in IPL’s current tariffs accepted by FERC through wholesale rate case proceedings. IPL’s current return on common equity authorized by FERC related to its wholesale electric rates is 10.97%. As a result of IPL’s requirement to supply electricity to Southern Minnesota Energy Cooperative under the wholesale power supply agreement, the sale of the electric distribution assets isdid not expected to have a significant impact on IPL’s current generation plans or operating results.

AFUDC - AFUDC represents costs to finance construction additions including a return on equity component and cost of debt component as required by regulatory accounting. The concurrent credit for the amount of AFUDC capitalized is recorded as “Allowance for funds used during construction” in the income statements. The amount of AFUDC generated by equity and debt components was as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2012 2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014 2016 2015 2014
Equity
$23.1
 
$20.3
 
$14.1
 
$17.1
 
$13.8
 
$5.2
 
$6.0
 
$6.5
 
$8.9

$42.3
 
$24.4
 
$23.1
 
$35.2
 
$18.6
 
$17.1
 
$7.1
 
$5.8
 
$6.0
Debt11.7
 10.5
 7.8
 8.8
 7.2
 3.2
 2.9
 3.3
 4.6
20.2
 12.5
 11.7
 16.8
 9.6
 8.8
 3.4
 2.9
 2.9

$34.8
 
$30.8
 
$21.9
 
$25.9
 
$21.0
 
$8.4
 
$8.9
 
$9.8
 
$13.5

$62.5
 
$36.9
 
$34.8
 
$52.0
 
$28.2
 
$25.9
 
$10.5
 
$8.7
 
$8.9

AFUDC related to various construction projects was recognized in the income statements as follows (in millions):
2014 2013 20122016 2015 2014
IPL:          
Emission controls - Ottumwa Unit 1
$10.6
 
$8.0
 
$2.0
Emission controls - George Neal Units 3 and 41.4
 5.1
 0.9
Marshalltown3.7
 
 

$43.8
 
$20.7
 
$3.7
Environmental controls - Ottumwa Unit 1
 
 10.6
Other10.2
 7.9
 5.5
8.2
 7.5
 11.6
25.9
 21.0
 8.4
52.0
 28.2
 25.9
WPL:          
Emission controls - Columbia Units 1 and 24.0
 7.2
 3.9
Emission controls - Edgewater Unit 52.7
 
 7.2
Environmental controls - Edgewater Unit 54.3
 5.1
 2.7
Other2.2
 2.6
 2.4
6.2
 3.6
 6.2
8.9
 9.8
 13.5
10.5
 8.7
 8.9
Alliant Energy
$34.8
 
$30.8
 
$21.9

$62.5
 
$36.9
 
$34.8

In addition to the emission controls projects discussed above that were placed in service in 2014, a scrubber and baghouse was placed in service at IPL’s George Neal Unit 4 in 2013 and an SCR was placed in service at WPL’s Edgewater Unit 5 in 2012.

Wind Generation Projects -
IPL’s Whispering Willow - East Wind Project - In 2011, IPL received an order from the MPUC approving a temporary recovery rate for the Minnesota retail portion of its Whispering Willow - East wind project construction costs. In its order, the MPUC did not reach a conclusion as to the prudence of these project costs. The prudence of these project costs and the final recovery rate was addressed in a separate proceeding in 2013. The initial recovery rate approved by the MPUC was below the amount required by IPL to recover the Minnesota retail portion of its total project costs. Based on its interpretation of the order, IPL believed that it was probable it would not be allowed to recover the entire Minnesota retail portion of its project costs. IPL estimated the most likely outcome of the final rate proceeding would result in the MPUC effectively disallowing recovery of approximately $8 million of project costs out of a total of approximately $30 million of project costs allocated to the Minnesota retail jurisdiction. As a result, Alliant Energy and IPL recognized an $8 million impairment related to this probable disallowance in 2011. In December 2013, IPL received an order from the MPUC approving full cost

119



recovery of the Minnesota retail portion of IPL’s Whispering Willow - East wind project construction costs effective January 1, 2013. As a result, Alliant Energy and IPL recognized a $7 million regulatory-related credit, which was recorded as an increase to property, plant and equipment on their balance sheets and a decrease to “Utility - Other operation and maintenance” in their income statements in 2013.

Non-regulated and Other - The non-regulated and other property, plant and equipment recorded on Alliant Energy’s balance sheets includes the following:

Non-regulated Generation -
Franklin County Wind ProjectFarm - The Franklin County wind projectfarm was placed into service in 2012 and is depreciated using the straight-line method over a 30-year period. Based on an evaluation of the strategic options for the Franklin County wind farm performed in 2016, Alliant Energy concluded it was probable the Franklin County wind farm will be transferred to IPL. As a result, Alliant Energy performed an impairment analysis of December 31, 2014,such assets in 2016. The impairment analysis evaluated the value of the assets and a reasonable estimate of the amount of costs associated with the Franklin County wind farm that would be allowed for recovery for IPL’s electric rate-making purposes. Based on various analyses, including discounted cash flows projected from the Franklin County wind farm, recently executed PPAs associated with wind generating facilities located near the Franklin County wind farm, and the cost of new wind farms identified through IPL’s planned wind expansion, the value of the Franklin County wind farm assets was determined to be approximately $33 million, subject to working capital adjustments. Alliant Energy concluded such value represents a reasonable estimate of the amount IPL will be allowed for recovery for IPL’s electric rate-making purposes. As a result, in 2016, the carrying amount of the Franklin County wind farm was reduced to such value, resulting in non-cash, pre-tax asset valuation charges of $86 million (after-tax charges of $51 million, or $0.23 per share). In 2016, Alliant Energy recorded $137 million onsuch charges as a reduction to “Non-regulated Generation, net” in the above table and charges to “Asset valuation charges for Franklin County wind farm” in its balance sheet relatedincome statement.

In February 2017, FERC issued an order approving the transfer of the Franklin County wind farm from AEF to IPL. Alliant Energy and IPL currently expect to complete this transfer in 2017. The final amount to be recovered for IPL’s electric rate-making purposes is expected to be determined by the wind project. ReferIUB as part of IPL’s retail electric rate case for the 2016 Test Year, currently anticipated to Note 5(d) for discussionbe filed in the second quarter of a cash grant received in 2013 related2017, and therefore the final asset valuation charges are subject to the wind project.change.

Sheboygan Falls - Sheboygan Falls was placed into service in 2005 and is depreciated using the straight-line method over a 35-year period. As of December 31, 20142016, Alliant Energy recorded $103$95 million on its balance sheet related to Sheboygan Falls.

Corporate Services and Other - Property, plant and equipment related to Corporate Services includes a customer billing and information system for IPL and WPL and other computer software, and the corporate headquarters building located in Madison, Wisconsin. Corporate Services is also implementing a newThe customer billing and information system for IPL and WPL, which is currently expected to be deployed in 2015. Asamortized using the straight-line method over a 12-year period. The majority of December 31, 2014, Alliant Energy recorded capitalized expenditures of $62 million and capitalized interest of $1 million for the customer billing and information system in “Corporate Services and other, net” in the above table for Alliant Energy.remaining software is amortized over a 5-year period. Property, plant and equipment related to Transportation includes a short-line railway in Iowa and a barge terminal on the Mississippi River and a coal terminal in Williams, Iowa.River. The Corporate Services and Other property, plant and equipment is depreciated using the straight-line method over periods ranging from 5 to 30 years.

(4)
NOTE 4. JOINTLY-OWNED ELECTRIC UTILITY PLANT
Under joint ownership agreements with other utilities, IPL and WPL have undivided ownership interests in jointly-owned coal-fired EGUs. Each of the respective owners is responsible for the financing of its portion of the construction costs. KWh generation and operating expenses are primarily divided between the joint owners on the same basis as ownership. IPL’s and WPL’s shares of expenses from jointly-owned coal-fired EGUs are included in the corresponding operating expenses (e.g., electric production fuel, other operation and maintenance, etc.) in their income statements. Refer to Note 2 for further discussion of cost of removal obligations. Information relative to IPL’s and WPL’s ownership interest in these jointly-owned coal-fired EGUs at December 31, 20142016 was as follows (dollars in millions):
     Accumulated Construction Cost of Removal    Accumulated Construction
In-service Ownership Electric Provision for Work in Obligations Included inOwnership Electric Provision for Work in
Dates Interest % Plant Depreciation Progress Regulatory LiabilitiesInterest % Plant Depreciation Progress
IPL                 
Ottumwa Unit 11981 48.0% 
$488.7
 
$131.6
 
$1.4
 
$11.0
48.0% 
$489.4
 
$137.3
 
$11.1
George Neal Unit 41979 25.7% 183.3
 71.3
 0.3
 12.3
25.7% 185.2
 80.8
 1.6
George Neal Unit 31975 28.0% 135.2
 41.3
 1.4
 6.0
28.0% 150.7
 49.1
 0.3
Louisa Unit 11983 4.0% 35.4
 20.4
 0.1
 3.3
4.0% 36.5
 21.8
 0.6
   842.6
 264.6
 3.2
 32.6
  861.8
 289.0
 13.6
WPL                 
Columbia Units 1-21975-1978 46.2% 549.0
 166.8
 18.9
 10.2
46.2% 640.2
 185.0
 51.0
Edgewater Unit 41969 68.2% 96.5
 55.4
 0.3
 2.5
68.2% 99.4
 58.4
 0.2
   645.5
 222.2
 19.2
 12.7
  739.6
 243.4
 51.2
Alliant Energy   
$1,488.1
 
$486.8
 
$22.4
 
$45.3
  
$1,601.4
 
$532.4
 
$64.8


120

TableIn November 2016, WPL received an order from the PSCW approving amendments to the Columbia joint operating agreement, which allow the co-owners to forgo certain capital expenditures at Columbia (excluding capital expenditures related to the Columbia Unit 2 SCR currently being constructed), resulting in WPL incurring these additional capital expenditures in exchange for a proportional increase in its ownership share of ContentsColumbia. Based on the additional capital expenditures WPL currently expects to incur through June 1, 2020, WPL’s ownership interest in Columbia is expected to increase in the future. In December 2016, WPL filed a request with FERC for approval of these amendments to the Columbia joint operating agreement, effective January 1, 2017. WPL currently expects to receive FERC’s decision on these amendments in 2017.

In November 2016, various electric cooperatives, which currently have wholesale power supply agreements with WPL, notified WPL of their intent to exercise purchase options for a partial ownership interest in the Riverside expansion. WPL currently expects the exercise of the purchase options to be effective in 2017.

(5)
NOTE 5. RECEIVABLES
(a)NOTE 5(a) Accounts Receivable - Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Customer, less allowance for doubtful accounts
$84.5
 
$81.8
 
$—
 
$—
 
$77.3
 
$73.0
Customer
$111.7
 
$93.8
 
$—
 
$4.6
 
$104.4
 
$81.5
Unbilled utility revenues85.4
 92.3
 
 
 85.4
 92.3
90.2
 83.1
 
 1.2
 90.2
 81.9
Deferred proceeds177.2
 203.5
 177.2
 203.5
 
 
211.1
 172.0
 211.1
 172.0
 
 
Other, less allowance for doubtful accounts80.2
 95.7
 39.5
 43.4
 23.1
 33.1
Other89.0
 53.5
 30.7
 22.8
 38.8
 25.7
Allowance for doubtful accounts(8.7) (4.8) (1.1) (0.6) (7.1) (3.7)

$427.3
 
$473.3
 
$216.7
 
$246.9
 
$185.8
 
$198.4

$493.3
 
$397.6
 
$240.7
 
$200.0
 
$226.3
 
$185.4

Allowance for doubtful accounts at December 31 was as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2014 2013 2014 2013
Customer
$3.7
 
$1.4
 
$—
 
$—
 
$3.7
 
$1.4
Other1.4
 3.4
 0.4
 0.7
 0.5
 0.3
 
$5.1
 
$4.8
 
$0.4
 
$0.7
 
$4.2
 
$1.7

(b)NOTE 5(b) Sales of Accounts Receivable - IPL maintains a Receivables Agreement whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. IPL pays a monthly fee to the third party that varies based on interest rates, seasonal limits on cash proceeds and the amount of cash proceedsamounts received from the third party. In March 2014,2016, IPL extended through March 20162018 the purchase commitment from the third party to which it sells its receivables. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In exchange for the receivables sold,2016, 2015 and 2014, IPL receivesreceived cash proceeds of up to $180$180 million from the third party.party in exchange for the receivables sold. Cash proceeds are used by IPL to meet short-term financing needs, and cannot exceed the current seasonal limit or amount of receivables available for sale, whichever is less. The seasonal limit on cash proceeds as of December 31, 20142016 was $150 million, and effective February 2017 the limit on cash

proceeds is $125 million. The Receivables Agreement can be terminated by the third party if arrears or write-offs exceed certain levels. IPL was in compliance with all related covenants as of December 31, 2016.

As of December 31, 2014,2016, IPL sold $204.6248.1 million of receivables to the third party, received $22.021.0 million in cash proceeds and recorded deferred proceeds of $177.2$211.1 million. Deferred proceeds represent IPL’s interest in the receivables sold to the third party. At IPL’s request, deferred proceeds are paid to IPL from collections of receivables, after paying any required expenses incurred by the third party and the collection agent. Corporate Services acts as collection agent for the third party and receives a fee for collection services. IPL believes that the allowance for doubtful accounts related to its sales of receivables is a reasonable approximation of credit risk of the customers that generated the receivables. In 2016, 2015 and 2014, IPL’s costs incurred related to the sales of accounts receivable program were not material. Refer to Note 14 for discussion of the fair value of deferred proceeds.

IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):
 2014 2013 2012
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances)$150.0 $170.0 $160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances)46.4 105.9 119.8
 Maximum Average
 2016 2015 2014 2016 2015 2014
Outstanding aggregate cash proceeds$172.0 $137.0 $150.0 $73.2 $46.7 $46.4

In 2014, 2013 and 2012, IPL’s costs incurred related to the sales of accounts receivable program were not material.


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As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
2014 20132016 2015
Customer accounts receivable$134.8 $151.6$157.6 $109.7
Unbilled utility revenues69.7 86.290.4 71.3
Other receivables0.1 0.20.1 0.1
Receivables sold to third party204.6 238.0248.1 181.1
Less: cash proceeds (a)22.0 29.021.0 5.0
Deferred proceeds182.6 209.0227.1 176.1
Less: allowance for doubtful accounts5.4 5.516.0 4.1
Fair value of deferred proceeds$177.2 $203.5$211.1 $172.0
Outstanding receivables past due$19.9 $21.5$68.0 $18.0

(a)Changes in cash proceeds are presented in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements.

Refer to Note 9(b) for discussion of IPL’s issuance of $250 million of senior debentures in 2014. A portion of the proceeds from the issuance was used by IPL in 2014 to reduce cash proceeds received from the third party under its sales of accounts receivable program.

Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
2014 2013 20122016 2015 2014
Collections reinvested in receivables$1,997.9 $1,880.8 $1,771.6$1,818.1 $1,812.9 $1,997.9
Credit losses, net of recoveries11.4 11.9 10.0
Write-offs, net of recoveries4.8 8.8 11.4

In connection with the implementation of IPL’s new customer billing and information system in 2016, IPL postponed the write-off of customer bills for a portion of 2016, resulting in lower write-offs in 2016 and higher outstanding receivables past due as of December 31, 2016.

(c)NOTE 5(c) Whiting Petroleum Tax Sharing Agreement - Prior to an initial public offering of Whiting Petroleum in 2003, Alliant Energy and Whiting Petroleum entered into a tax separation and indemnification agreement pursuant to which Alliant Energy and Whiting Petroleum made certain tax elections. These tax elections had the effect of increasing the tax basis of the assets of Whiting Petroleum’s consolidated tax group based on the sales price of Whiting Petroleum’s shares in the initial public offering. The increase in the tax basis of the assets was included inas income in Alliant Energy’s U.S. federal income tax return for the calendar year 2003. Pursuant to the tax separation and indemnification agreement, Whiting Petroleum paid ResourcesAlliant Energy the final payment of $26 million in 2014, which represented the present value of certain future tax benefits expected to be realized by Whiting Petroleum through future tax deductions. The final payment resulted in a decrease in “Current assets - Other” on Alliant Energy’s balance sheet in 2014. The $26 million received by Alliant Energy is presented in operating activities in its cash flows statement in 2014.

(d) Franklin County Wind Project Cash Grant - The ARRA provides incentives for wind projects placed into service between January 1, 2009 and December 31, 2012. In accordance with the ARRA, Alliant Energy filed an application with the U.S. Department of the Treasury in February 2013 requesting a cash grant for a portion of the qualifying project expenditures of the Franklin County wind project that was placed into service in December 2012. Alliant Energy elected to record the anticipated cash grant as a reduction of the carrying value of the Franklin County wind project. In 2013, Alliant Energy received $62.4 million of proceeds from the cash grant, which are presented in investing activities in Alliant Energy’s cash flows statement in 2013. The grant proceeds were used by Alliant Energy to reduce short-term borrowings incurred during the construction of the wind project.


122NOTE 6. INVESTMENTS

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(6) INVESTMENTS
(a)NOTE 6(a) Unconsolidated Equity Investments - Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting are as follows (in millions):
Ownership Carrying Value at  
Interest at December 31, Equity (Income) / LossOwnership Interest at Carrying Value at December 31, Equity (Income) / Loss
December 31, 2014 2014 2013 2014 2013 2012December 31, 2016 2016 2015 2016 2015 2014
Alliant Energy                    
ATC (a)16% 
$286.5
 
$272.1
 
($41.9) 
($42.7) 
($41.3)16% 
$317.6
 
$293.3
 
($39.1) 
($34.2) 
($41.9)
Wisconsin River Power Company50% 7.8
 7.0
 (0.9) (1.0) (0.8)
OtherVarious 2.3
 2.3
 2.4
 
 0.8
Various 8.4
 9.6
 (0.5) 0.4
 1.5
 
$296.6
 
$281.4
 
($40.4) 
($43.7) 
($41.3) 
$326.0
 
$302.9
 
($39.6) 
($33.8) 
($40.4)
WPL                    
ATC (a)16% 
$286.5
 
$272.1
 
($41.9) 
($42.7) 
($41.3)
ATC—% 
$—
 
$293.3
 
($39.1) 
($34.2) 
($41.9)
Wisconsin River Power Company50% 7.8
 7.0
 (0.9) (1.0) (0.8)50% 7.7
 8.7
 (0.7) (0.9) (0.9)
 
$294.3
 
$279.1
 
($42.8) 
($43.7) 
($42.1) 
$7.7
 
$302.0
 
($39.8) 
($35.1) 
($42.8)

(a)
Alliant Energy and WPL havecurrently has the ability to exercise significant influence over ATC’s financial and operating policies through theirits participation on ATC’s Board of Directors. Refer to Note 18 for information regarding related party transactions with ATC.

Summary aggregate financial information from the financial statements of these investments is as follows (in millions):
Alliant Energy WPLAlliant Energy WPL
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Operating revenues
$643
 
$634
 
$611
 
$643
 
$634
 
$611

$658
 
$624
 
$643
 
$658
 
$624
 
$643
Operating income330
 334
 326
 330
 334
 325
331
 299
 330
 331
 299
 330
Net income240
 248
 234
 240
 250
 239
232
 186
 240
 234
 202
 240
As of December 31:                      
Current assets72
 86
   70
 84
  82
 88
   6
 87
  
Non-current assets3,773
 3,553
   3,747
 3,527
  4,340
 3,987
   19
 3,977
  
Current liabilities315
 383
   315
 383
  498
 332
   3
 332
  
Non-current liabilities1,871
 1,682
   1,870
 1,681
  2,144
 2,052
   7
 2,052
  

MISO Transmission Owner Return on Equity Complaints - A group of MISO cooperative and municipal utilities previously filed two complaints with FERC requesting a reduction of the base return on equity used by MISO transmission owners, including ATC. In September 2016, FERC issued an order on the first complaint to reduce the base return on equity for the refund period from November 12, 2013 through February 11, 2015. In June 2016, a FERC administrative law judge issued an initial decision regarding the second complaint recommending a reduction of the base return on equity for the refund period from February 12, 2015 through May 11, 2016. A final decision on the second complaint from FERC is currently expected in the first half of 2017. Alliant Energy and WPL have realized a cumulative $24 million of reductions in the amount of equity income from ATC as a result of the two complaints through December 31, 2016, including $9 million, $12 million and $3 million realized in 2016, 2015 and 2014, respectively.

WPL’s Noncontrolling Interest and Investment in ATC - Prior to 2014, WPL owned 100% of WPL Transco, which holdsheld Alliant Energy’s investment in ATC. In January 2014, WPL Transco’s operating agreement was amended to allow ATI, a wholly-owned subsidiary of Resources,AEF, to become a member of WPL Transco in addition to WPL. In 2014, ATI began funding capital contributions that WPL Transco makesmade to ATC. As of December 31, 2014, WPL’s and ATI’s ownership interests in WPL Transco were approximately 95% and 5%, respectively. WPL continues to consolidate WPL Transco and as a result, ATI’s ownership interest in WPL Transco was recorded as a noncontrolling interest in total equity on WPL’s balance sheet as of December 31, 2014.

In 2014, WPL Transco’s equity income from ATC and ATC dividends received by WPL Transco were allocated between WPL and ATI based on their respective ownership interests at the time the equity income was generated and at the time of the dividend payments. Prior to the transfer of the investment in ATC to ATI discussed below, WPL consolidated WPL Transco, and ATI’s ownership interest in WPL Transco is expected to increasewas recorded as a resultnoncontrolling interest in total equity on WPL’s balance sheets.

In June 2016, WPL received an order from the PSCW requiring WPL to transfer its investment in ATC to Alliant Energy or an Alliant Energy subsidiary by December 31, 2022. On December 31, 2016, pursuant to the PSCW order, WPL Transco was liquidated and WPL transferred its investment in ATC to ATI. In conjunction with the transfer of future capital contributionsthe investment in ATC, a deferred intercompany tax gain recognized by WPL was assumed by ATI. The impact of WPL’s transfer of the ATC investment, including the assumption of such intercompany tax gain by ATI, was recorded as a net reduction in total equity of $163.6 million on WPL’s balance sheet. WPL’s income statement includes all of the equity earnings from ATC through December 31, 2016, the date of transfer. There were no impacts of this transfer to WPL Transco. Alliant Energy’s aggregate ownership percentageconsolidated financial statements. As of December 31, 2016, ATI owns Alliant Energy’s entire investment in ATC is not expected to change as a result of WPL Transco’s amended operating agreement.ATC.

(b)NOTE 6(b) Cash Surrender Value of Life Insurance Policies - Various life insurance policies cover certain current and former employees and directors. In 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $31 million and $19 million were recorded in investing activities in Alliant Energy’s and IPL’s cash flow statements, respectively. At December 31, the cash surrender value of these investments was as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2014 2013 2014 2013
Cash surrender value$47.0 $46.5 $18.1 $17.3 $11.4 $12.3
 Alliant Energy IPL WPL
 2016 2015 2016 2015 2016 2015
Cash surrender value$10.6 $42.3 $— $18.9 $5.8 $6.4


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(7)NOTE 7. COMMON EQUITY
Common Stock Split - On April 20, 2016, Alliant Energy’s Board of Directors approved a two-for-one common stock split and a proportionate increase in the number of authorized shares of common stock of Alliant Energy from 240 million shares to 480 million shares to implement the stock split. Alliant Energy shareowners of record at the close of business on May 4, 2016 received one additional share of Alliant Energy common stock for each share held on that date. The proportionate interest that a shareowner owns in Alliant Energy did not change as a result of the stock split. The additional shares were distributed on May 19, 2016 and post-split trading began on May 20, 2016. All Alliant Energy share and per share amounts in this report have been reflected on a post-split basis.

Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
2014 2013 20122016 2015 2014
Shares outstanding, January 1110,943,669
 110,987,400
 111,018,821
226,918,432
 221,871,360
 221,887,338
At-the-market offering program
 4,373,234
 
Shareowner Direct Plan issuances732,814
 606,010
 
Equity-based compensation plans (Note 12(b))
35,547
 (23,374) 20,195
22,408
 112,756
 71,094
Other(43,536) (20,357) (51,616)
 (44,928) (87,072)
Shares outstanding, December 31110,935,680
 110,943,669
 110,987,400
227,673,654
 226,918,432
 221,871,360

At December 31, 20142016, Alliant Energy had a total of 7.811.3 million shares available for issuance in the aggregate, pursuant to its Amended and Restated OIP, Shareowner Direct Plan and 401(k) Savings Plan.

At-the-Market Offering Program - In 2015, Alliant Energy filed a prospectus supplement under which it may sell up to $150 million of its common stock through an at-the-market offering program. In 2015, Alliant Energy issued 4,373,234 shares of common stock through this program and received cash proceeds of $133 million, net of $2 million in fees and commissions. The proceeds from the issuances of common stock were used for general corporate purposes. This at-the-market offering program expired in 2016.

Shareowner Direct Plan - Beginning in 2015, Alliant Energy satisfied its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock through original issue, rather than on the open market.

Shareowner Rights Agreement - Alliant Energy has established an amended and restated Shareowner Rights Agreement. The rights under this agreement will only become exercisable if a person or group has acquired, or announced an intention to acquire, 15% or more of Alliant Energy’s outstanding common stock. Each right will initially entitle registered shareowners to purchase from Alliant Energy one-halfone-quarter of one share of Alliant Energy’s common stock. The rights will be exercisable at an initial price of $110.00$55.00 per full share, subject to adjustment. If any shareowner acquires 15% or more of the outstanding common stock of Alliant Energy, each right (subject to limitations) will entitle its holder to purchase, at the right’s then current exercise price, a number of common shares of Alliant Energy or of the acquirer having a market value at the time of twice the right’s per full share exercise price. Alliant Energy’s Board of Directors is authorized to reduce the 15% ownership threshold to not less than 10%. The amended and restated Shareowner Rights Agreement expires in December 2018. Alliant Energy currently has no intention to redeem the Shareowner Rights Agreement and plans to allow it to naturally expire at the end of the term.

Dividend Restrictions - Alliant Energy does not have any significant common stock dividend restrictions. IPL and WPL each have common stock dividend restrictions based on applicable regulatory limitations. IPL also has common stock dividend restrictions based on the terms of its outstanding preferred stock. As of December 31, 2014,2016, IPL and WPL were in compliance with all such dividend restrictions.


IPL is restricted from paying common stock dividends to its parent company, Alliant Energy, if for any past or current dividend period, dividends on its preferred stock have not been paid, or declared and set apart for payment. IPL has paid all dividends on its preferred stock through 2014.

2016. Under the Federal Power Act, IPL may not pay dividends to its parent company in excess of the current amount of its retained earnings. Another limitation onAs of December 31, 2016, IPL’s distributions to its parent company requires IPL to obtain IUB approval for a reasonable utility capital structure if itsamount of retained earnings that were free of dividend restrictions was $618 million. If IPL’s actual 13-month13-month average common equity ratio (calculated on a financial basis consistent with IPL’s rate cases) falls below 42% of total capitalization. As of December 31, 2014, IPL’s amount of retained earnings that were free of dividend restrictions was $538 million.capitalization, IPL is required to notify the IUB.

Currently,Pursuant to a December 2016 PSCW order, WPL has a regulatory limitation on distributions to its parent company from an order issued by the PSCW in July 2014. The order prohibitscompany. WPL is prohibited from paying annual common stock dividends to its parent company in excess of $127forecasted dividend levels of $126 million in 20152017 and $135$140 million in 20162018 if WPL’s actual 13-month average common equity ratio (calculated on a financial basis consistent with WPL’s rate cases) would fall below 51.79%51.00% for 2015 and 52.25% for 2016.2017 or 2018. As of December 31, 2014,2016, WPL’s amount of retained earnings that were free of dividend restrictions was $127$126 million for 2015.2017.

Restricted Net Assets of Subsidiaries - IPL and WPL do not have regulatory authority to lend or advance any amounts to their parent company. As of December 31, 2016, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was as follows (in billions):$1.6 billion for each.
 2014 2013
IPL
$1.3
 
$1.2
WPL1.6
 1.5


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Capital Transactions With Subsidiaries - IPL, WPL and Resources paid common stock dividends and repayments of capital to their parent company, Alliant Energy, as follows (in millions):
 IPL WPL Resources
 2014 2013 2012 2014 2013 2012 2014 2013 2012
Common stock dividends
$140.0
 
$128.1
 
$122.9
 
$118.7
 
$116.3
 
$112.0
 
$—
 
$—
 
$—
Repayments of capital
 
 
 
 
 
 50.0
 95.0
 
Total distributions from common equity
$140.0
 
$128.1
 
$122.9
 
$118.7
 
$116.3
 
$112.0
 
$50.0
 
$95.0
 
$—

IPL, WPL and Corporate Services received capital contributions from their parent company, Alliant Energy, as follows (in millions):
 2014 2013 2012
IPL
$90.0
 
$120.0
 
$110.0
WPL
 
 90.0
Corporate Services
 
 30.0

Comprehensive Income - In 20142016, 20132015 and 20122014, Alliant Energy’s other comprehensive income (loss) was ($0.4) million$0, $0.60.2 million and $0($0.4) million, respectively; therefore, its comprehensive income was substantially equal to its net income and its comprehensive income attributable to Alliant Energy common shareowners was substantially equal to its net income attributable to Alliant Energy common shareowners for such periods. In 2014, 20132016, 2015 and 2012,2014, IPL and WPL had no other comprehensive income; therefore their comprehensive income was equal to their net income and their comprehensive income available for common stock was equal to their earnings available for common stock for such periods.

(8)NOTE 8. REDEEMABLE PREFERRED STOCK
IPL is authorized to issue up to 16,000,000 shares of cumulative preferred stock in aggregate. Information related to the carrying value of IPL’s cumulative preferred stock at December 31 was as follows:
Liquidation Preference/Stated Value Shares Authorized Shares Outstanding Series 2014 2013
        (in millions)
$25 16,000,000 8,000,000 5.1% 
$200.0
 
$200.0
Series Liquidation Preference/Stated Value Shares Authorized Shares Outstanding 2016 2015
        (in millions)
5.1% $25 8,000,000 8,000,000 
$200.0
 
$200.0

IPL - In 2013, IPL issued 8,000,000 shares of 5.1% cumulative preferred stock and received proceeds of $200 million. The proceeds were used by IPL to redeem its 8.375% cumulative preferred stock, reduce commercial paper classified as long-term debt by $40 million and for other general corporate purposes. Alliant Energy and IPL incurred $5 million of issuance costs related to this transaction, which were recorded as a reduction of additional paid-in capital on Alliant Energy’s and IPL’s balance sheets in 2013. On or after March 15, 2018, IPL may, at its option, redeem the 5.1% cumulative preferred stock for cash at a redemption price of $25 per share plus accrued and unpaid dividends up to the redemption date.

The current articles of incorporation of IPL contain a provision that grants the holders of its cumulative preferred stock voting rights to elect two members of IPL’s Board of Directors if preferred dividends equal to six or more quarterly dividend requirements (whether or not consecutive) are in arrears. Such voting rights would not provide the holders of IPL’s preferred stock control of the decision on redemption of IPL’s preferred stock and could not force IPL to exercise its call option. Therefore, IPL’s cumulative preferred stock is presented in total equity on Alliant Energy’s and IPL’s balance sheets in a manner consistent with noncontrolling interests.

In 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their income statements.

Refer to Note 14 for information on the fair value of cumulative preferred stock.

WPL - In 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their income statements.

NOTE 9. DEBT

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(9) DEBT
(a)NOTE 9(a) Short-term Debt - Alliant Energy and its subsidiaries maintain committed bank lines of credit to provide short-term borrowing flexibility and back-stop liquidity for commercial paper outstanding. At December 31, 2014,2016, Alliant Energy’s short-term borrowing arrangements included three revolving credit facilities totaling $1 billion ($300 million for Alliant Energy at the parent company level, $300 million for IPL and $400 million for WPL), which expire in December 2018. Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions):
 Alliant Energy IPL WPL
 2014 2013 2014 2013 2014 2013
December 31           
Commercial paper:           
Amount outstanding$141.3 $279.4 $— $— $— $183.7
Weighted average interest rates0.4% 0.2% N/A N/A N/A 0.1%
Weighted average remaining maturity4 days 4 days N/A N/A N/A 6 days
Available credit facility capacity$858.7 $720.6 $300.0 $300.0 $400.0 $216.3
 Alliant Energy IPL WPL
December 312016 2015 2016 2015 2016 2015
Commercial paper outstanding$244.1 $159.8 $— $— $52.3 $19.9
Commercial paper weighted average interest rates0.9% 0.7% N/A N/A 0.7% 0.4%
Available credit facility capacity$755.9 $840.2 $300.0 $300.0 $347.7 $380.1
Alliant Energy IPL WPL
2014 2013 2014 2013 2014 2013Alliant Energy IPL WPL
For the year ended 2016 2015 2016 2015 2016 2015
Maximum amount outstanding
(based on daily outstanding balances)
$353.8 $293.9 $38.0 $26.3 $204.7 $190.0$251.8 $181.2 $3.1 $18.4 $118.3 $24.7
Average amount outstanding
(based on daily outstanding balances)
$255.9 $210.5 $0.2 $1.3 $122.9 $123.5$179.0 $119.2 $— $0.2 $38.1 $2.2
Weighted average interest rates0.2% 0.2% 0.2% 0.4% 0.1% 0.2%0.6% 0.4% 0.7% 0.4% 0.4% 0.3%

Financial Covenants - The credit facility agreements and Alliant Energy’sAEF’s term loan credit agreement each contain a financial covenant, which requires Alliant Energy, IPL and WPL to maintain certain debt-to-capital ratios in order to borrow under the credit facilities and term loan credit agreement. The required debt-to-capital ratios compared to the actual debt-to-capital ratios at December 31, 20142016 were as follows:
Alliant Energy IPL WPLAlliant Energy IPL WPL
Requirement, not to exceed65% 58% 58%65% 58% 58%
Actual52% 47% 49%53% 47% 49%

The debt component of the capital ratios includes long- and short-term debt (excluding non-recourse debt and hybrid securities to the extent the total carrying value of such hybrid securities does not exceed 15% of consolidated capital of the applicable borrower), capital lease obligations, certain letters of credit, guarantees of the foregoing and new synthetic leases. Unfunded vested benefits under qualified pension plans and sales of accounts receivable are not included in the debt-to-capital ratios. The equity component of the capital ratios excludes accumulated other comprehensive income (loss).


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(b)NOTE 9(b) Long-Term Debt - Long-term debt, net as of December 31 was as follows (dollars in millions):
2014 20132016 2015
Alliant Energy IPL WPL Alliant Energy IPL WPLAlliant Energy IPL WPL Alliant Energy IPL WPL
Senior Debentures:           
3.3%, due 2015
$150.0
 
$150.0
 
$—
 
$150.0
 
$150.0
 
$—
Senior Debentures (a):           
5.875%, due 2018100.0
 100.0
 
 100.0
 100.0
 

$100.0
 
$100.0
 
$—
 
$100.0
 
$100.0
 
$—
7.25%, due 2018250.0
 250.0
 
 250.0
 250.0
 
250.0
 250.0
 
 250.0
 250.0
 
3.65%, due 2020200.0
 200.0
 
 200.0
 200.0
 
200.0
 200.0
 
 200.0
 200.0
 
3.25%, due 2024 (a)250.0
 250.0
 
 
 
 
3.25%, due 2024250.0
 250.0
 
 250.0
 250.0
 
3.4%, due 2025250.0
 250.0
 
 250.0
 250.0
 ���
5.5%, due 202550.0
 50.0
 
 50.0
 50.0
 
50.0
 50.0
 
 50.0
 50.0
 
6.45%, due 2033100.0
 100.0
 
 100.0
 100.0
 
100.0
 100.0
 
 100.0
 100.0
 
6.3%, due 2034125.0
 125.0
 
 125.0
 125.0
 
125.0
 125.0
 
 125.0
 125.0
 
6.25%, due 2039300.0
 300.0
 
 300.0
 300.0
 
300.0
 300.0
 
 300.0
 300.0
 
4.7%, due 2043250.0
 250.0
 
 250.0
 250.0
 
250.0
 250.0
 
 250.0
 250.0
 
3.7%, due 2046 (b)300.0
 300.0
 
 
 
 
1,775.0
 1,775.0
 
 1,525.0
 1,525.0
 
2,175.0
 2,175.0
 
 1,875.0
 1,875.0
 
Debentures:           
Debentures (a):           
5%, due 2019250.0
 
 250.0
 250.0
 
 250.0
250.0
 
 250.0
 250.0
 
 250.0
4.6%, due 2020150.0
 
 150.0
 150.0
 
 150.0
150.0
 
 150.0
 150.0
 
 150.0
2.25%, due 2022250.0
 
 250.0
 250.0
 
 250.0
250.0
 
 250.0
 250.0
 
 250.0
6.25%, due 2034100.0
 
 100.0
 100.0
 
 100.0
100.0
 
 100.0
 100.0
 
 100.0
6.375%, due 2037300.0
 
 300.0
 300.0
 
 300.0
300.0
 
 300.0
 300.0
 
 300.0
7.6%, due 2038250.0
 
 250.0
 250.0
 
 250.0
250.0
 
 250.0
 250.0
 
 250.0
4.1%, due 2044 (b)250.0
 
 250.0
 
 
 
1,550.0
 
 1,550.0
 1,300.0
 
 1,300.0
Pollution Control Revenue Bonds:           
5%, due 2015 (c)16.0
 
 16.0
 24.5
 
 24.5
5.375%, due 201514.6
 
 14.6
 14.6
 
 14.6
5% (d)
 
 
 38.4
 38.4
 
4.1%, due 2044250.0
 
 250.0
 250.0
 
 250.0
30.6
 
 30.6
 77.5
 38.4
 39.1
1,550.0
 
 1,550.0
 1,550.0
 
 1,550.0
Other:                      
Term loan credit agreement through 2016, 1% at December 31, 2014 (e)250.0
 
 
 
 
 
Term loan credit agreement through 2016, 1% at December 31, 2014 (f)60.0
 
 
 
 
 
3.45% senior notes, due 202275.0
 
 
 75.0
 
 
5.06% senior secured notes, due 2015 to 202458.9
 
 
 60.5
 
 
4% senior notes (e)
 
 
 250.0
 
 
Term loan credit agreement, 1% at December 31, 2013 (f)
 
 
 60.0
 
 
Other, 1% at December 31, 2014, due 2015 to 20253.3
 
 
 0.4
 
 
AEF term loan credit agreement through 2018, 1% at December 31, 2016 (c)(d)500.0
 
 
 
 
 
Corporate Services 3.45% senior notes, due 2022 (a)75.0
 
 
 75.0
 
 
Sheboygan Power, LLC 5.06% senior secured notes, due 2017 to 2024 (secured by Sheboygan Falls and related assets) (a)53.8
 
 
 56.8
 
 
Alliant Energy term loan credit agreement, 1% at December 31, 2015 (Retired in 2016) (c)
 
 
 250.0
 
 
Franklin County Holdings LLC term loan credit agreement, 1% at December 31, 2015 (Retired in 2016) (c)
 
 
 60.0
 
 
Other, 1% at December 31, 2016, due 2017 to 20253.3
 
 
 3.7
 
 
447.2
 
 
 445.9
 
 
632.1
 
 
 445.5
 
 
Subtotal3,802.8
 1,775.0
 1,580.6
 3,348.4
 1,563.4
 1,339.1
4,357.1
 2,175.0
 1,550.0
 3,870.5
 1,875.0
 1,550.0
Current maturities(183.0) (150.0) (30.6) (358.5) (38.4) (8.5)(4.6) 
 
 (313.4) 
 
Unamortized debt issuance costs(23.4) (13.7) (9.1) (22.3) (11.8) (9.9)
Unamortized debt (discount) and premium, net(13.1) (6.3) (6.7) (12.1) (5.0) (7.0)(13.5) (7.8) (5.7) (12.6) (6.3) (6.2)
Long-term debt, net
$3,606.7
 
$1,618.7
 
$1,543.3
 
$2,977.8
 
$1,520.0
 
$1,323.6
Long-term debt, net (e)
$4,315.6
 
$2,153.5
 
$1,535.2
 
$3,522.2
 
$1,856.9
 
$1,533.9

(a)Contains optional redemption provisions which, if elected by the issuer at its sole discretion, could require material redemption premium payments by the issuer. The redemption premium payments under these optional redemption provisions are variable and dependent on applicable U.S. Treasury rates at the time of redemption.
(b)In 2014,2016, IPL issued $250.0$300 million of 3.25%3.7% senior debentures due 2024.2046. The proceeds from the issuance were used by IPL to reduce cash proceedsamounts received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt by $60$100 million and for general corporate purposes.
(b)In 2014, WPL issued $250.0 million of 4.1% debentures due 2044. The proceeds from the issuance were used by WPL to reduce commercial paper and for general corporate purposes.
(c)In 2014, WPL retired $8.5 million of its 5% pollution control revenue bonds.
(d)In 2014, IPL retired its $38.4 million, 5% pollution control revenue bonds.
(e)In 2014, Alliant Energy2016, AEF entered into a $250.0$500 million variable-rate term loan credit agreement and used the proceeds from borrowings under this agreement to retire its $250.0 million, 4% senior notes due 2014.Alliant Energy’s and Franklin County Holdings LLC’s variable-rate term loan credit agreements that matured in 2016, reduce outstanding commercial paper at Alliant Energy and for general corporate purposes.
(f)(d)In 2014, Franklin County Holdings LLC, Resources’ wholly-owned subsidiary, entered into
Refer to Note 9(a) for discussion of a $60.0 million variable-ratefinancial covenant contained in AEF’s term loan credit agreement and usedagreement.
(e)There were no significant sinking fund requirements related to the proceeds to retire its borrowings under a term loan credit agreement that matured in December 2014.outstanding long-term debt.

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Five-Year Schedule of Debt Maturities - At December 31, 20142016, debt maturities for 20152017 through 20192021 were as follows (in millions):
2015 2016 2017 2018 20192017 2018 2019 2020 2021
IPL
$150
 
$—
 
$—
 
$350
 
$—

$—
 
$350
 
$—
 
$200
 
$—
WPL31
 
 
 
 250

 
 250
 150
 
Resources2
 63
 5
 6
 6
Alliant Energy parent company
 250
 
 
 
AEF5
 506
 6
 7
 8
Alliant Energy
$183
 
$313
 
$5
 
$356
 
$256

$5
 
$856
 
$256
 
$357
 
$8

At December 31, 2014, there were no significant sinking fund requirements related to the long-term debt on the balance sheets.

Indentures - IPL maintains an indenture related to all of its outstanding senior debentures. WPL maintains an indenture related to all of its outstanding debentures. Sheboygan Power, LLC, Resources’ wholly-owned subsidiary, maintains an indenture related to the issuance of its 5.06% senior secured notes due 2015 to 2024.

Optional Redemption Provisions - Alliant Energy and its subsidiaries have certain issuances of long-term debt that contain optional redemption provisions which, if elected by the issuer at its sole discretion, could require material redemption premium payments by the issuer. The redemption premium payments under these optional redemption provisions are variable and dependent on applicable U.S. Treasury rates at the time of redemption. At December 31, 2014, the debt issuances that contained these optional redemption provisions included all of IPL’s outstanding senior debentures, all of WPL’s outstanding debentures, Corporate Services’ senior notes due 2022 and Sheboygan Power, LLC’s senior secured notes due 2015 to 2024.

Security Provisions - Sheboygan Power, LLC’s 5.06% senior secured notes due 2015 to 2024 are secured by Sheboygan Falls and related assets.

Financial Covenant - Alliant Energy’s term loan credit agreement contains a financial covenant, which requires it to maintain a certain debt-to-capital ratio in order to borrow under the agreement. Refer to Note 9(a) for further discussion.

Unamortized Debt Issuance Costs - Unamortized debt issuance costs recorded in “Deferred charges and other” on the balance sheets at December 31 were as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2014 2013 2014 2013
Unamortized debt issuance costs$22.4 $19.9 $10.7 $9.7 $10.8 $9.0

Carrying Amount and Fair Value of Long-term Debt - Refer to Note 14 for information on the carrying amount and fair value of long-term debt outstanding.

(10)NOTE 10. LEASES
(a)NOTE 10(a) Operating Leases - Various agreements have been entered into related to property, plant and equipment rights that are accounted for as operating leases. Historically, Alliant Energy’sIn 2016, 2015 and WPL’s most significant operating lease related to the Riverside PPA, which contained fixed2014, rental payments related to capacity and contingent rental payments related to the energy portion (actual MWhs) of the PPA. Costs associated with the Riverside PPA were included in “Electric production fuel and energy purchases” and “Purchased electric capacity” in Alliant Energy’s and WPL’s income statements based on monthly payments for the Riverside PPA. In December 2012, WPL purchased Riverside, thereby terminating the Riverside PPA. Rental expenses associated with operating leases were as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2012 2014 2013 2012 2014 2013 2012
Operating lease rental expenses (excluding contingent rentals)
$12
 
$9
 
$69
 
$4
 
$4
 
$4
 
$7
 
$5
 
$64
Contingent rentals (primarily related to the Riverside PPA)
 
 6
 
 
 
 
 
 5
 
$12
 
$9
 
$75
 
$4
 
$4
 
$4
 
$7
 
$5
 
$69


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not material. At December 31, 2014,2016, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):
2015 2016 2017 2018 2019 Thereafter Total2017 2018 2019 2020 2021 Thereafter Total
Alliant Energy
$8
 
$7
 
$3
 
$2
 
$1
 
$21
 
$42

$6
 
$6
 
$2
 
$2
 
$1
 
$15
 
$32
IPL3
 2
 2
 1
 1
 15
 24
3
 2
 1
 1
 1
 10
 18
WPL4
 5
 1
 
 
 
 10
3
 4
 
 
 
 
 7

(b)NOTE 10(b) Capital Leases -
WPL - In 2005, WPL entered into a 20-year agreement with Resources’AEF’s Non-regulated Generation business to lease Sheboygan Falls, with an option for two lease renewal periods thereafter. The lease became effective in 2005 when Sheboygan Falls began commercial operation. WPL is responsible for the operation of Sheboygan Falls and has exclusive rights to its output. In 2005,output, and the PSCW approved this affiliated lease agreement with initial monthly lease payments of approximately $1.3 million. The lease payments were based on a 50% debt to capital ratio, a return on equity of 10.9%, a cost of debt based on the cost of senior notes issued by Resources’ Non-regulated Generation business in 2005 and certain costs incurred to construct the facility. In accordance with its order approving the lease agreement, the PSCW reserved the right to review the capital structure, return on equity and cost of debt every five years from the date of the order. No revisions to the lease have been made since its inception.2005. The capital lease asset is amortized using the straight-line method over the 20-year lease term. Since the inception of the lease in 2005, WPL’s retail and wholesale rates have includedinclude recovery of the monthly Sheboygan Falls lease payments. Sheboygan Falls lease expenses were included in WPL’s income statements as follows (in millions):
2014 2013 20122016 2015 2014
Interest expense
$10.4
 
$10.9
 
$11.3

$9.3
 
$9.9
 
$10.4
Depreciation and amortization6.2
 6.2
 6.2
6.2
 6.2
 6.2

$16.6
 
$17.1
 
$17.5

$15.5
 
$16.1
 
$16.6

At December 31, 20142016, WPL’s estimated future minimum capital lease payments for Sheboygan Falls were as follows (in millions):
 2015 2016 2017 2018 2019 Thereafter Total Less: amount representing interest Present value of minimum capital lease payments
Sheboygan Falls$15 $15 $15 $15 $15 $83 $158 $63 $95
 2017 2018 2019 2020 2021 Thereafter Total Less: amount representing interest Present value of minimum capital lease payments
Sheboygan Falls$15 $15 $15 $15 $15 $53 $128 $44 $84

(11)NOTE 11. INCOME TAXES
Income Tax Expense (Benefit) - The components of “Income tax expense (benefit)” in the income statements were as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2012 2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014 2016 2015 2014
Current tax expense (benefit):                                  
Federal
$36.6
 
$4.4
 
($29.3) 
$11.3
 
$11.7
 
($7.7) 
$0.6
 
($5.7) 
$7.2

$1.8
 
$2.0
 
$36.6
 
($12.8) 
($14.1) 
$8.9
 
($22.3) 
$4.7
 
$2.0
State9.3
 (3.6) 11.6
 3.4
 (0.1) 9.1
 4.4
 6.0
 (0.9)17.2
 3.2
 9.3
 15.5
 11.5
 10.4
 1.1
 0.6
 0.8
IPL’s tax benefit riders(56.7) (52.9) (48.3) (56.7) (52.9) (48.3) 
 
 
(44.2) (49.0) (56.7) (44.2) (49.0) (56.7) 
 
 
Deferred tax expense (benefit):                                  
Federal83.5
 123.9
 157.8
 11.1
 20.0
 37.4
 88.9
 92.7
 81.1
112.8
 120.8
 83.5
 59.1
 40.7
 10.8
 112.3
 76.8
 81.1
State4.6
 15.6
 23.9
 (6.2) (0.8) 3.2
 10.1
 11.8
 20.3
4.9
 27.9
 4.6
 (9.0) 3.3
 (7.9) 20.8
 20.2
 20.0
Production tax credits(31.3) (31.0) (24.8) (14.0) (14.4) (12.5) (17.3) (16.6) (12.3)(31.8) (33.1) (31.3) (14.0) (14.5) (13.8) (17.8) (18.6) (17.5)
Investment tax credits(1.6) (1.6) (1.7) (0.6) (0.6) (0.6) (1.0) (1.0) (1.1)(1.3) (1.4) (1.6) (0.5) (0.6) (0.6) (0.8) (0.8) (1.0)
Provision recorded as a change in uncertain tax positions:                 
Current
 
 8.0
 
 
 8.1
 
 
 (0.1)
Deferred
 (0.4) (7.6) 
 
 (8.2) 
 (0.4) 0.6
Provision recorded as a change in accrued interest(0.1) (0.5) (0.2) 
 (0.8) (0.3) (0.1) 0.4
 (0.2)
 
 (0.1) 
 
 
 
 
 (0.1)

$44.3
 
$53.9
 
$89.4
 
($51.7) 
($37.9) 
($19.8) 
$85.6
 
$87.2
 
$94.6

$59.4
 
$70.4
 
$44.3
 
($5.9) 
($22.7) 
($48.9) 
$93.3
 
$82.9
 
$85.3


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Income Tax Rates - The overall income tax rates shown in the following table were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes.
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2012 2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014 2016 2015 2014
Statutory federal income tax rate35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0%35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0% 35.0%
State income taxes, net of federal benefits5.4
 5.7
 5.7
 5.0
 5.4
 5.8
 5.5
 6.0
 5.5
5.4
 5.2
 5.4
 6.4
 6.2
 6.1
 5.1
 5.1
 5.1
IPL’s tax benefit riders(12.9) (12.1) (11.2) (39.6) (34.8) (37.0) 
 
 
(10.0) (10.6) (12.9) (20.1) (28.3) (39.6) 
 
 
Effect of rate-making on property-related differences(7.5) (6.0) (5.0) (21.9) (15.9) (14.2) (0.7) (0.8) (1.1)(8.5) (6.8) (7.5) (16.2) (17.2) (21.9) (0.7) (0.5) (0.7)
Production tax credits(7.1) (7.1) (5.8) (9.8) (9.5) (9.6) (6.5) (6.3) (4.7)(7.2) (7.2) (7.1) (6.3) (8.3) (9.6) (6.2) (7.1) (6.6)
Adjustment of prior period taxes(1.3) (1.3) 
 (3.5) (3.6) 0.2
 (0.1) (0.1) (0.3)(0.8) 0.8
 (1.3) (1.2) 0.7
 (3.0) (0.1) 0.1
 
State apportionment change due to announced sale of RMT
 
 3.5
 
 
 6.2
 
 
 2.7
Other items, net(1.5) (1.8) (1.4) (1.4) (1.5) (1.6) (1.1) (0.9) (0.8)(0.5) (1.1) (1.5) (0.3) (1.2) (1.2) (0.5) (0.8) (0.8)
Overall income tax rate10.1% 12.4% 20.8% (36.2%) (24.9%) (15.2%) 32.1% 32.9% 36.3%13.4% 15.3% 10.1% (2.7%) (13.1%) (34.2%) 32.6% 31.8% 32.0%

IPL’s tax benefit riders - Alliant Energy’s and IPL’s effective income tax rates include the impact of reducing income tax expense with offsetting reductions to regulatory liabilities as a result of implementing the tax benefit riders. Refer to Note 2 for additional details on IPL’s tax benefit riders.

Effect of rate-making on property-related differences - Alliant Energy’s and IPL’s income tax expense and benefits are impacted by certain property-related differences at IPL for which deferred tax is not recognized in the income statement pursuant to Iowa rate-making principles. For example, tax expenses and benefits related to mixed service costs and repairs expenditures at IPL are recorded as a component of income tax expense pursuant to Iowa rate-making principles. In 2013, the primary factor contributing to the increase in the current tax benefits recorded for the effect of rate-making on property-related differences was increased repairs expenditures and the equity component of AFUDC at IPL. In 2014, the increased benefits from property-related differences were primarily due to additional repairs deductions and additional deductions from the allocation of mixed service costs related to Marshalltown.

Production tax credits - Production tax credits are earned from owned and operated wind projects. Production tax credits are based on the electricity generated by each wind project during the first 10 years of operation. Details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions):
 End of Production Nameplate     
 Tax Credit Generation Capacity in MW2014 2013 2012
Cedar Ridge (WPL)December 2018 68
$4.0
 
$4.1
 
$4.0
Bent Tree (WPL)February 2021 20113.3
 12.5
 8.3
Subtotal (WPL)   17.3
 16.6
 12.3
Whispering Willow - East (IPL)December 2019 20014.0
 14.4
 12.5
    
$31.3
 
$31.0
 
$24.8

State apportionment change due to announced sale of RMT - State apportionment projections are utilized to record deferred tax assets and liabilities each reporting period. Deferred tax assets and liabilities for temporary differences between the tax basis of assets and liabilities and the amounts reported in the financial statements are recorded utilizing currently enacted tax rates and estimates of future state apportionment rates expected to be in effect at the time the temporary differences reverse. These state apportionment projections are most significantly impacted by the estimated amount of revenues expected in the future from each state jurisdiction for Alliant Energy’s consolidated tax groups, including both its regulated and its non-regulated operations. In 2012, Alliant Energy, IPL and WPL recorded $15 million, $8 million and $7 million, respectively, of deferred income tax expense due to changes in state apportionment projections caused by the announced sale of Alliant Energy’s RMT business.


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Deferred Tax Assets and Liabilities - The deferred income tax (assets)assets and liabilities included on Alliant Energy’sthe balance sheets at December 31 arise from the following temporary differences (in millions):
 2014 2013
 DeferredDeferred Tax  DeferredDeferred Tax 
Alliant EnergyTax AssetsLiabilitiesNet Tax AssetsLiabilitiesNet
Property
$—

$2,627.8

$2,627.8
 
$—

$2,316.3

$2,316.3
Investment in ATC
131.6
131.6
 
120.7
120.7
Net operating losses carryforwards - state(45.7)
(45.7) (35.3)
(35.3)
Regulatory liability - IPL’s tax benefit riders(100.9)
(100.9) (107.8)
(107.8)
Federal credit carryforwards(201.0)
(201.0) (167.8)
(167.8)
Net operating losses carryforwards - federal(332.8)
(332.8) (251.9)
(251.9)
Other(88.1)180.1
92.0
 (108.9)210.7
101.8
Subtotal
($768.5)
$2,939.5

$2,171.0
 
($671.7)
$2,647.7

$1,976.0
 2014 2013
Current deferred tax assets
($150.1) 
($136.7)
Non-current deferred tax liabilities2,321.1
 2,112.7
Total net deferred tax liabilities
$2,171.0
 
$1,976.0

The deferred income tax (assets) and liabilities included on IPL’s balance sheets at December 31 arise from the following temporary differences (in millions):
 2014 2013
 DeferredDeferred Tax  DeferredDeferred Tax 
IPLTax AssetsLiabilitiesNet Tax AssetsLiabilitiesNet
Property
$—

$1,531.0

$1,531.0
 
$—

$1,338.1

$1,338.1
Federal credit carryforwards(67.7)
(67.7) (52.9)
(52.9)
Regulatory liability - tax benefit riders(100.9)
(100.9) (107.8)
(107.8)
Net operating losses carryforwards - federal(160.6)
(160.6) (111.3)
(111.3)
Other(47.2)81.9
34.7
 (64.0)103.2
39.2
 
($376.4)
$1,612.9

$1,236.5
 
($336.0)
$1,441.3

$1,105.3
 2014 2013
Current deferred tax assets
($104.9) 
($87.7)
Non-current deferred tax liabilities1,341.4
 1,193.0
Total net deferred tax liabilities
$1,236.5
 
$1,105.3

The deferred income tax (assets) and liabilities included on WPL’s balance sheets at December 31 arise from the following temporary differences (in millions):
 2014 2013
 DeferredDeferred Tax  DeferredDeferred Tax 
WPLTax AssetsLiabilitiesNet Tax AssetsLiabilitiesNet
Property
$—

$964.4

$964.4
 
$—

$859.1

$859.1
Investment in ATC
131.6
131.6
 
120.7
120.7
Federal credit carryforwards(75.2)
(75.2) (57.1)
(57.1)
Net operating losses carryforwards - federal(128.9)
(128.9) (106.9)
(106.9)
Other(40.3)80.9
40.6
 (37.6)75.6
38.0
 
($244.4)
$1,176.9

$932.5
 
($201.6)
$1,055.4

$853.8
 2014 2013
Current deferred tax assets
($37.5) 
($43.3)
Non-current deferred tax liabilities970.0
 897.1
Total net deferred tax liabilities
$932.5
 
$853.8
 Alliant Energy IPL WPL
 2016 2015 2016 2015 2016 2015
Deferred tax liabilities:           
Property
$2,919.0
 
$2,762.9
 
$1,677.0
 
$1,587.8
 
$1,124.5
 
$1,027.0
Investment in ATC153.1
 138.1
 
 
 
 138.9
Other95.3
 157.3
 71.4
 87.8
 59.1
 67.9
Total deferred tax liabilities3,167.4
 3,058.3
 1,748.4
 1,675.6
 1,183.6
 1,233.8
Deferred tax assets:           
Federal credit carryforwards268.4
 236.4
 95.9
 81.7
 112.9
 95.5
Net operating losses carryforwards - federal173.3
 250.9
 69.6
 113.1
 75.4
 105.1
Regulatory liability - IPL’s tax benefit riders34.7
 66.1
 34.7
 66.1
 
 
Net operating losses carryforwards - state32.9
 38.3
 0.6
 1.1
 0.1
 3.6
Other87.9
 85.4
 35.8
 35.6
 23.6
 24.2
Total deferred tax assets597.2
 677.1
 236.6
 297.6
 212.0
 228.4
Total deferred tax liabilities, net
$2,570.2
 
$2,381.2
 
$1,511.8
 
$1,378.0
 
$971.6
 
$1,005.4

Property - Property-related differences were primarily related to accelerated depreciation, including bonus depreciation. In December 2014,2015, the FTIPPATH Act was enacted. The most significant provisions of the FTIPPATH Act for Alliant Energy, IPL and WPL

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are related relate to the extension of bonus depreciation deductions for certain expenditures for property that were incurred through December 31, 2014. As a result,2019 and placed in service prior to December 31, 2020. Alliant Energy currently estimates its total bonus depreciation deductions to be claimed on its U.S. federal income tax return for calendar year 20142016 will be approximately $450$350 million ($245100 million for IPL and $190$200 million for WPL). Property-related differences also related to tax accounting method changes for cost of removal expenditures and repair expenditures for electric generation property, which are discussed in Note 2.

Investment in ATC - WPL Transco has a partial ownership interest in ATC, which has generated deferred tax liabilities primarily from tax depreciation deductions taken at ATC in excess of book depreciation. The increase in deferred tax liabilities in 2014 was primarily due to bonus depreciation deductions estimated at ATC.

Carryforwards - At December 31, 20142016, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (in millions):
Alliant EnergyTax Carryforwards 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses
$970
 
$333
 2029
State net operating losses (a)881
 46
 2018
Federal tax credits204
 201
 2022
   
$580
  
IPLTax Carryforwards 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses
$468
 
$161
 2029
State net operating losses (b)291
 16
 2018
Federal tax credits69
 68
 2022
   
$245
  
WPLTax Carryforwards 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses
$376
 
$129
 2029
State net operating losses (c)171
 9
 2018
Federal tax credits77
 75
 2022
   
$213
  

(a)At December 31, 2014, Alliant Energy’s state net operating losses carryforwards had expiration dates ranging from 2018 to 2033 with 98% expiring after 2024.
(b)At December 31, 2014, IPL’s state net operating losses carryforwards had expiration dates ranging from 2018 to 2031 with 96% expiring after 2024.
(c)At December 31, 2014, WPL’s state net operating losses carryforwards had expiration dates ranging from 2018 to 2031 with 99% expiring after 2024.

Regulatory liability - tax benefit riders - Refer to Note 2 for discussion of regulatory liabilities associated with IPL’s tax benefit riders.
 Range of Expiration Dates Alliant Energy IPL WPL
Federal net operating losses2030-2034 
$506
 
$206
 
$215
State net operating losses2018-2034 673
 12
 2
Federal tax credits2022-2036 274
 100
 113

Uncertain Tax Positions - A reconciliation of the beginningAt December 31, 2016, 2015 and ending amounts of2014, there were no uncertain tax positions excluding interest, is as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2012 2014 2013 2012 2014 2013 2012
Balance, January 1
$—
 
$0.7
 
$23.5
 
$—
 
$—
 
$10.9
 
$—
 
$0.7
 
$12.6
Additions based on tax positions related to the current year
 
 0.7
 
 
 
 
 
 0.7
Reductions for tax positions of prior years (a)
 (0.7) (23.5) 
 
 (10.9) 
 (0.7) (12.6)
Balance, December 31
$—
 
$—
 
$0.7
 
$—
 
$—
 
$—
 
$—
 
$—
 
$0.7

(a)In 2012, the reductions for tax positions of prior years were due to the finalization of Alliant Energy’s federal income tax return audits for calendar years 2005 through 2009.


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At December 31, 2014, 2013 and 2012, there were noor penalties accrued related to uncertain tax positions, and interest accrued and tax positions favorably impacting future effective tax rates for continuing operations were not material. As of December 31, 2014,2016, no material changes to unrecognized tax benefits are expected during the next 12 months.

Open tax years - Tax years that remain subject to the statute of limitations in the major jurisdictions for each of Alliant Energy, IPL and WPL are as follows:
Alliant Energy IPL WPL
Consolidated federal income tax returns (a)2011-2013 2011-2013 2011-20132013-2015
Consolidated Iowa income tax returns (b)2011-2013 2011-2013 2011-20132013-2015
Wisconsin combined tax returns (c)2010-2013 2010-2013 2010-20132012-2015


(a)TheseThe federal tax returns for 2013 and 2014 are effectively settled as a result of participation in the IRS Compliance Assurance Program, which allows Alliant Energy and the IRS to work together to resolve issues related to Alliant Energy’s current tax year before filing its federal income tax return. The statute of limitations for these federal tax returns expires three years from each filing date.
(b)The statute of limitations for these Iowa tax returns expires three years from each filing date.
(c)The statute of limitations for these Wisconsin combined tax returns expires four years from each filing date.

(12)NOTE 12. BENEFIT PLANS
(a)NOTE 12(a) Pension and Other Postretirement Benefits Plans - Retirement benefits are provided to substantially all employees through various qualified and non-qualified non-contributory defined benefit pension plans (currently closed to new hires), and/or through defined contribution plans (including 401(k) savings plans). Qualified and non-qualified non-contributory defined benefit pension plans are currently closed to new hires. Benefits of the non-contributory defined benefit pension plans are based on the plan participant’s years of service, age and compensation. Benefits of the defined contribution plans are based on the plan participant’s years of service, age, compensation and contributions. Certain defined benefit postretirement health care and life benefits are provided to eligible retirees. In general, the retiree health care plans consist of fixed benefit subsidy structures and the retiree life insurance plans are non-contributory.

IPL and WPL account for their participation in Alliant Energy and Corporate Services sponsored plans as multiple-employer plans. In IPL’s and WPL’s tables below, the defined benefit pension plans amounts represent those respective amounts for their bargaining unit employees covered under the qualified plans that they sponsor, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In IPL’s and WPL’s tables below, the OPEB plans amounts represent respective amounts for their employees, as well as amounts directly assigned to them related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.

Assumptions - The assumptions for defined benefit pension and OPEB plans at the measurement date of December 31 were as follows:
Defined Benefit Pension Plans OPEB PlansDefined Benefit Pension Plans OPEB Plans
Alliant Energy2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Discount rate for benefit obligations4.18% 4.97% 4.11% 3.97% 4.59% 3.82%4.19% 4.47% 4.18% 3.98% 4.30% 3.97%
Discount rate for net periodic cost4.97% 4.11% 4.86% 4.59% 3.82% 4.60%4.47% 4.18% 4.97% 4.30% 3.97% 4.59%
Expected rate of return on plan assets7.60% 7.60% 7.90% 7.40% 7.40% 7.50%7.60% 7.60% 7.60% 6.30% 6.20% 7.40%
Rate of compensation increase3.50%-4.50% 3.50%-4.50% 3.50%-4.50% N/A 3.50% 3.50%3.65%-4.50% 3.65%-4.50% 3.50%-4.50% N/A N/A N/A
Medical cost trend on covered charges:            
Initial trend rate (end of year)N/A N/A N/A 6.75% 7.00% 7.50%N/A N/A N/A 7.00% 7.25% 6.75%
Ultimate trend rateN/A N/A N/A 5.00% 5.00% 5.00%N/A N/A N/A 5.00% 5.00% 5.00%
Qualified Defined Benefit Pension Plan OPEB PlansQualified Defined Benefit Pension Plan OPEB Plans
IPL2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Discount rate for benefit obligations4.20% 5.05% 4.20% 3.94% 4.55% 3.76%4.22% 4.50% 4.20% 3.95% 4.28% 3.94%
Discount rate for net periodic cost5.05% 4.20% 4.95% 4.55% 3.76% 4.60%4.50% 4.20% 5.05% 4.28% 3.94% 4.55%
Expected rate of return on plan assets7.60% 7.60% 7.90% 7.60% 7.50% 7.40%7.60% 7.60% 7.60% 6.60% 6.60% 7.60%
Rate of compensation increase3.50% 3.50% 3.50% N/A 3.50% 3.50%3.65% 3.65% 3.50% N/A N/A N/A
Medical cost trend on covered charges:  
Initial trend rate (end of year)N/A N/A N/A 6.75% 7.00% 7.50%N/A N/A N/A 7.00% 7.25% 6.75%
Ultimate trend rateN/A N/A N/A 5.00% 5.00% 5.00%N/A N/A N/A 5.00% 5.00% 5.00%

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Qualified Defined Benefit Pension Plan OPEB PlansQualified Defined Benefit Pension Plan OPEB Plans
WPL2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Discount rate for benefit obligations4.20% 5.05% 4.20% 3.96% 4.56% 3.81%4.23% 4.51% 4.20% 3.96% 4.28% 3.96%
Discount rate for net periodic cost5.05% 4.20% 4.95% 4.56% 3.81% 4.60%4.51% 4.20% 5.05% 4.28% 3.96% 4.56%
Expected rate of return on plan assets7.60% 7.60% 7.90% 7.30% 7.20% 7.00%7.60% 7.60% 7.60% 4.70% 4.60% 7.30%
Rate of compensation increase3.50% 3.50% 3.50% N/A 3.50% 3.50%3.65% 3.65% 3.50% N/A N/A N/A
Medical cost trend on covered charges:  
Initial trend rate (end of year)N/A N/A N/A 6.75% 7.00% 7.50%N/A N/A N/A 7.00% 7.25% 6.75%
Ultimate trend rateN/A N/A N/A 5.00% 5.00% 5.00%N/A N/A N/A 5.00% 5.00% 5.00%


Expected rate of return on plan assets - The expected rate of return on plan assets is determined by analysis of projected asset class returns based on the target asset class allocations. A forward-looking building blocks approach is used, and historical returns, survey information and capital market information are reviewed to support the expected rate of return on plan assets assumption. Refer to “Investment Policy and Strategy for Plan Assets” below for additional information related to investment policy, and strategy and mix of assets for the pension and OPEB plans.

Life Expectancy - The life expectancy assumption is used in determining the benefit obligation and net periodic benefit cost for defined benefit pension and OPEB plans. This assumption was updated for the measurement date as of December 31, 2014 to utilize new mortality tables that were released in 2014 by the Society of Actuaries. TheActuaries and updated life expectancy assumption resulted in a significant increase to the associated obligations of the pension2015 and OPEB plans.2016.

Net Periodic Benefit Costs (Credits) - The components of net periodic benefit costs (credits) for sponsored defined benefit pension and OPEB plans are included in the tables below (in millions). In the “IPL”Net periodic benefit costs are primarily included in “Other operation and “WPL” tables below, the defined benefit pension plans costs represent those respective costs for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to their current and former non-bargaining employees who are participantsmaintenance” in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans costs (credits) represent costs (credits) for IPL and WPL employees, respectively, as well as amounts directly assigned to each of IPL and WPL related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.income statements.
Alliant EnergyDefined Benefit Pension Plans OPEB PlansDefined Benefit Pension Plans OPEB Plans
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Service cost
$13.1
 
$15.7
 
$13.5
 
$5.2
 
$6.3
 
$6.9

$12.6
 
$15.9
 
$13.1
 
$5.3
 
$5.5
 
$5.2
Interest cost54.1
 49.0
 51.6
 9.5
 8.5
 10.2
53.0
 53.6
 54.1
 9.4
 9.1
 9.5
Expected return on plan assets (a)(74.9) (74.0) (68.8) (8.3) (8.1) (7.5)(65.5) (75.0) (74.9) (6.1) (8.4) (8.3)
Amortization of prior service cost (credit) (b)
 0.2
 0.3
 (11.9) (11.9) (12.0)(0.3) (0.2) 
 (4.1) (11.3) (11.9)
Amortization of actuarial loss (c)19.5
 36.2
 33.3
 2.4
 4.9
 6.3
37.4
 35.4
 19.5
 4.7
 4.8
 2.4
Additional benefit costs (d)
 9.0
 0.1
 
 
 

 0.5
 
 
 
 
Settlement losses (e)
 
 5.4
 
 
 

$11.8
 
$36.1
 
$35.4
 
($3.1) 
($0.3) 
$3.9

$37.2
 
$30.2
 
$11.8
 
$9.2
 
($0.3) 
($3.1)
IPLDefined Benefit Pension Plans OPEB PlansDefined Benefit Pension Plans OPEB Plans
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Service cost
$7.2
 
$8.6
 
$7.5
 
$2.4
 
$2.9
 
$3.0

$7.5
 
$8.8
 
$7.2
 
$2.3
 
$2.4
 
$2.4
Interest cost25.1
 22.9
 24.1
 3.9
 3.6
 4.4
24.5
 25.0
 25.1
 3.8
 3.8
 3.9
Expected return on plan assets (a)(35.7) (35.2) (32.6) (5.8) (5.6) (5.1)(30.9) (35.8) (35.7) (4.3) (5.7) (5.8)
Amortization of prior service cost (credit) (b)
 0.1
 0.2
 (6.3) (6.3) (6.3)(0.2) (0.1) 
 (2.6) (6.1) (6.3)
Amortization of actuarial loss (c)8.0
 15.2
 14.1
 1.1
 2.7
 3.5
16.5
 15.3
 8.0
 2.6
 2.3
 1.1
Additional benefit costs (d)
 2.6
 
 
 
 

$4.6
 
$14.2
 
$13.3
 
($4.7) 
($2.7) 
($0.5)
$17.4
 
$13.2
 
$4.6
 
$1.8
 
($3.3) 
($4.7)

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WPLDefined Benefit Pension Plans OPEB PlansDefined Benefit Pension Plans OPEB Plans
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Service cost
$4.9
 
$5.9
 
$5.2
 
$2.0
 
$2.5
 
$2.7

$4.9
 
$5.8
 
$4.9
 
$2.0
 
$2.1
 
$2.0
Interest cost22.6
 20.7
 21.6
 3.8
 3.4
 4.1
22.3
 22.6
 22.6
 3.8
 3.7
 3.8
Expected return on plan assets (a)(32.4) (31.9) (29.6) (1.3) (1.3) (1.3)(28.3) (32.4) (32.4) (0.8) (1.5) (1.3)
Amortization of prior service cost (credit) (b)0.3
 0.3
 0.4
 (3.9) (3.9) (3.9)0.2
 0.2
 0.3
 (0.9) (3.5) (3.9)
Amortization of actuarial loss (c)9.2
 17.1
 15.7
 1.3
 1.9
 2.3
17.6
 16.8
 9.2
 1.8
 2.2
 1.3
Additional benefit costs (d)
 0.6
 0.1
 
 
 

 0.5
 
 
 
 

$4.6
 
$12.7
 
$13.4
 
$1.9
 
$2.6
 
$3.9

$16.7
 
$13.5
 
$4.6
 
$5.9
 
$3.0
 
$1.9

(a)The expected return on plan assets is based on the expected rate of return on plan assets and the fair value approach to the market-related value of plan assets.
(b)Unrecognized prior service costs (credits) for the OPEB plans are amortized over the average future service period to full eligibility of the participants of each plan.
(c)Unrecognized net actuarial gains or losses in excess of 10% of the greater of the plans’ benefit obligations or assets are amortized over the average future service lives of plan participants, except for the Alliant Energy Cash Balance Pension Plan where gains or losses outside the 10% threshold are amortized over the time period the participants are expected to receive benefits.
(d)
In 2013, Alliant Energy filed a stipulation agreement with the Court related to the class-action lawsuit against the Cash Balance Plan. As a result, Alliant Energy recognized $9.0 million of additional benefits costs in 2013 related to the agreement. IPL recognized $5.5 million ($2.6 million directly assigned and $2.9 million allocated by Corporate Services) and WPL recognized $2.8 million ($0.6 million directly assigned and $2.2 million allocated by Corporate Services) of additional benefits costs in 2013 related to the agreement.
(e)Settlement losses related to payments made to retired executives of Alliant Energy.

Corporate Services provides services to IPL and WPL, and as a result, IPL and WPL are allocated pension and OPEB costs (credits) associated with Corporate Services employees. Such costs (credits) are allocated to IPL and WPL based on total productive labor costs. The following table includes the allocated qualified and non-qualified pension and OPEB costs (credits) associated with Corporate Services employees providing services to IPL and WPL (in millions):
 Pension Benefits Costs (a) OPEB Costs (Credits)
 2014 2013 2012 2014 2013 2012
IPL
$1.4
 
$4.8
 
$4.9
 
($0.3) 
($0.3) 
$0.1
WPL1.1
 3.6
 3.6
 (0.2) (0.2) 0.1

(a)Refer to IPL’s and WPL’s “Net Periodic Benefit Costs (Credits)” tables above for additional benefits costs related to the Cash Balance Plan allocated to IPL and WPL by Corporate Services in 2013.

The estimated amortization from “Regulatory assets” and “Regulatory liabilities” on the balance sheets and AOCL on Alliant Energy’s balance sheet into net periodic benefit cost in 20152017 is as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
Defined Benefit   Defined Benefit   Defined Benefit  Defined Benefit   Defined Benefit   Defined Benefit  
Pension Plans OPEB Plans Pension Plans OPEB Plans Pension Plans OPEB PlansPension Plans OPEB Plans Pension Plans OPEB Plans Pension Plans OPEB Plans
Actuarial loss
$35.4
 
$4.9
 
$15.3
 
$2.3
 
$16.8
 
$2.3

$37.5
 
$3.8
 
$16.1
 
$2.0
 
$18.5
 
$1.6
Prior service cost (credit)(0.3) (11.3) (0.1) (6.1) 0.2
 (3.5)(0.4) (0.2) (0.2) 
 0.1
 (0.2)

$35.1
 
($6.4) 
$15.2
 
($3.8) 
$17.0
 
($1.2)
$37.1
 
$3.6
 
$15.9
 
$2.0
 
$18.6
 
$1.4

Net periodic benefit costs are primarily included in “Utility - Other operation and maintenance” in the income statements.


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Benefit Plan Assets and Obligations - A reconciliation of the funded status of Alliant Energy’s qualified and non-qualified defined benefit pension and OPEB plans to the amounts recognized on Alliant Energy’s balance sheets at December 31 was as follows (in millions):
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
Alliant Energy2014 2013 2014 20132016 2015 2016 2015
Change in benefit obligation:              
Net benefit obligation at January 1
$1,113.4
 
$1,207.5
 
$208.7
 
$223.2

$1,206.3
 
$1,301.5
 
$221.4
 
$231.1
Service cost13.1
 15.7
 5.2
 6.3
12.6
 15.9
 5.3
 5.5
Interest cost54.1
 49.0
 9.5
 8.5
53.0
 53.6
 9.4
 9.1
Plan participants’ contributions
 
 2.8
 2.6

 
 2.4
 3.1
Plan amendments
 
 
 (0.3)
Additional benefit costs
 9.0
 
 

 0.5
 
 
Actuarial (gain) loss195.8
 (94.1) 22.3
 (13.2)48.3
 (70.1) (0.3) (9.4)
Gross benefits paid(74.9) (73.7) (17.4) (18.7)(75.9) (95.1) (18.1) (17.7)
Net benefit obligation at December 311,301.5
 1,113.4
 231.1
 208.7
1,244.3
 1,206.3
 220.1
 221.4
Change in plan assets:              
Fair value of plan assets at January 11,022.9
 965.6
 124.9
 123.1
895.0
 1,018.1
 106.9
 121.6
Actual return on plan assets66.4
 128.5
 5.6
 14.4
74.3
 (30.2) 8.2
 (4.9)
Employer contributions3.7
 2.5
 5.7
 3.5
2.3
 2.2
 6.4
 4.8
Plan participants’ contributions
 
 2.8
 2.6

 
 2.4
 3.1
Gross benefits paid(74.9) (73.7) (17.4) (18.7)(75.9) (95.1) (18.1) (17.7)
Fair value of plan assets at December 311,018.1
 1,022.9
 121.6
 124.9
895.7
 895.0
 105.8
 106.9
Under funded status at December 31
($283.4) 
($90.5) 
($109.5) 
($83.8)
($348.6) 
($311.3) 
($114.3) 
($114.5)
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
Alliant Energy2014 2013 2014 20132016 2015 2016 2015
Amounts recognized on the balance sheets consist of:              
Non-current assets
$—
 
$—
 
$6.1
 
$14.5

$—
 
$—
 
$3.2
 
$3.0
Other current liabilities(2.5) (2.4) (5.6) (4.8)(6.5) (2.6) (8.6) (6.2)
Pension and other benefit obligations(280.9) (88.1) (110.0) (93.5)(342.1) (308.7) (108.9) (111.3)
Net amounts recognized at December 31
($283.4) 
($90.5) 
($109.5) 
($83.8)
($348.6) 
($311.3) 
($114.3) 
($114.5)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):       
Amounts recognized in Regulatory Assets (refer to Note 2 for details) and AOCL (refer to Alliant Energy’s common equity statements for details) consist of:
       
Net actuarial loss
$533.4
 
$348.6
 
$60.7
 
$38.1

$535.1
 
$533.1
 
$52.6
 
$59.8
Prior service credit(7.4) (7.4) (16.7) (28.6)(6.9) (7.2) (1.5) (5.6)

$526.0
 
$341.2
 
$44.0
 
$9.5

$528.2
 
$525.9
 
$51.1
 
$54.2

(a)
Refer to Note 2 and Alliant Energy’s common equity statements for amounts recognized in “Regulatory assets” and “AOCL,” respectively, on Alliant Energy’s balance sheets. At December 31, 2014 and 2013, $1.1 million and $5.1 million, respectively, of regulatory liabilities were recognized related to Alliant Energy’s OPEB plans.

In the “IPL” and “WPL” tables below, the defined benefit pension plans amounts represent those respective amounts for IPL’s and WPL’s bargaining unit employees covered under the qualified plans that are sponsored by IPL and WPL, respectively, as well as amounts directly assigned to each of IPL and WPL related to their current and former non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans. In the “IPL” and “WPL” tables below, the OPEB plans amounts represent amounts for IPL and WPL employees, respectively, as well as amounts directly assigned to each of IPL and WPL related to their current and former non-bargaining employees who are participants in the Corporate Services sponsored OPEB plan.


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A reconciliation of the funded status of IPL’s qualified and non-qualified defined benefit pension and OPEB plans to the amounts recognized on IPL’s balance sheets at December 31 was as follows (in millions):
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
IPL2014 2013 2014 20132016 2015 2016 2015
Change in benefit obligation:              
Net benefit obligation at January 1
$514.0
 
$559.2
 
$87.8
 
$96.0

$556.1
 
$603.1
 
$91.3
 
$96.4
Service cost7.2
 8.6
 2.4
 2.9
7.5
 8.8
 2.3
 2.4
Interest cost25.1
 22.9
 3.9
 3.6
24.5
 25.0
 3.8
 3.8
Plan participants’ contributions
 
 0.9
 0.9

 
 0.9
 1.0
Additional benefit costs
 2.6
 
 
Plan amendments
 
 
 (0.1)
Actuarial (gain) loss91.4
 (44.3) 8.6
 (7.0)19.1
 (32.3) (0.7) (4.6)
Gross benefits paid(34.6) (35.0) (7.2) (8.6)(36.8) (48.5) (7.5) (7.6)
Net benefit obligation at December 31603.1
 514.0
 96.4
 87.8
570.4
 556.1
 90.1
 91.3
Change in plan assets:              
Fair value of plan assets at January 1485.9
 458.8
 81.2
 78.8
422.7
 484.7
 69.2
 78.7
Actual return on plan assets32.1
 61.2
 3.6
 10.0
35.3
 (14.3) 5.3
 (3.1)
Employer contributions1.3
 0.9
 0.2
 0.1
0.8
 0.8
 0.3
 0.2
Plan participants’ contributions
 
 0.9
 0.9

 
 0.9
 1.0
Gross benefits paid(34.6) (35.0) (7.2) (8.6)(36.8) (48.5) (7.5) (7.6)
Fair value of plan assets at December 31484.7
 485.9
 78.7
 81.2
422.0
 422.7
 68.2
 69.2
Under funded status at December 31
($118.4) 
($28.1) 
($17.7) 
($6.6)
($148.4) 
($133.4) 
($21.9) 
($22.1)
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
IPL2014 2013 2014 20132016 2015 2016 2015
Amounts recognized on the balance sheets consist of:              
Non-current assets
$—
 
$—
 
$1.2
 
$8.8

$—
 
$—
 
$0.4
 
$—
Other current liabilities(0.8) (0.8) 
 
(0.7) (0.8) (1.9) 
Pension and other benefit obligations(117.6) (27.3) (18.9) (15.4)(147.7) (132.6) (20.4) (22.1)
Net amounts recognized at December 31
($118.4) 
($28.1) 
($17.7) 
($6.6)
($148.4) 
($133.4) 
($21.9) 
($22.1)
Amounts recognized in Regulatory Assets and Regulatory Liabilities consist of (a):       
Amounts recognized in Regulatory Assets consist of (refer to Note 2 for details):
       
Net actuarial loss
$233.1
 
$146.1
 
$27.9
 
$18.2

$233.6
 
$235.5
 
$25.4
 
$29.8
Prior service credit(2.6) (2.6) (8.7) (15.0)(2.3) (2.5) 
 (2.7)

$230.5
 
$143.5
 
$19.2
 
$3.2

$231.3
 
$233.0
 
$25.4
 
$27.1

(a)
Refer to Note 2 for amounts recognized in “Regulatory assets” on IPL’s balance sheets. At December 31, 2014 and 2013, $0 and $1.0 million, respectively, of regulatory liabilities were recognized related to IPL’s OPEB plans.


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A reconciliation of the funded status of WPL’s qualified and non-qualified defined benefit pension and OPEB plans to the amounts recognized on WPL’s balance sheets at December 31 was as follows (in millions):
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
WPL2014 2013 2014 20132016 2015 2016 2015
Change in benefit obligation:              
Net benefit obligation at January 1
$460.8
 
$506.7
 
$85.6
 
$89.1

$505.9
 
$547.6
 
$89.7
 
$94.0
Service cost4.9
 5.9
 2.0
 2.5
4.9
 5.8
 2.0
 2.1
Interest cost22.6
 20.7
 3.8
 3.4
22.3
 22.6
 3.8
 3.7
Plan participants’ contributions
 
 1.3
 1.2

 
 1.2
 1.6
Plan amendments
 
 
 (0.2)
Additional benefit costs
 0.6
 
 

 0.5
 
 
Actuarial (gain) loss86.7
 (41.1) 9.2
 (3.0)25.7
 (30.0) 0.5
 (3.5)
Gross benefits paid(27.4) (32.0) (7.9) (7.6)(29.6) (40.6) (8.3) (8.0)
Net benefit obligation at December 31547.6
 460.8
 94.0
 85.6
529.2
 505.9
 88.9
 89.7
Change in plan assets:              
Fair value of plan assets at January 1438.8
 415.4
 21.7
 22.3
386.8
 440.3
 18.7
 21.8
Actual return on plan assets28.6
 55.2
 1.2
 2.5
32.4
 (13.0) 1.2
 (1.1)
Employer contributions0.3
 0.2
 5.5
 3.3
0.1
 0.1
 5.8
 4.4
Plan participants’ contributions
 
 1.3
 1.2

 
 1.2
 1.6
Gross benefits paid(27.4) (32.0) (7.9) (7.6)(29.6) (40.6) (8.3) (8.0)
Fair value of plan assets at December 31440.3
 438.8
 21.8
 21.7
389.7
 386.8
 18.6
 18.7
Under funded status at December 31
($107.3) 
($22.0) 
($72.2) 
($63.9)
($139.5) 
($119.1) 
($70.3) 
($71.0)
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
WPL2014 2013 2014 20132016 2015 2016 2015
Amounts recognized on the balance sheets consist of:              
Non-current assets
$—
 
$—
 
$4.9
 
$5.8

$—
 
$—
 
$2.7
 
$3.0
Other current liabilities(0.1) (0.2) (5.5) (4.8)(0.1) (0.1) (6.4) (6.0)
Pension and other benefit obligations(107.2) (21.8) (71.6) (64.9)(139.4) (119.0) (66.6) (68.0)
Net amounts recognized at December 31
($107.3) 
($22.0) 
($72.2) 
($63.9)
($139.5) 
($119.1) 
($70.3) 
($71.0)
Amounts recognized in Regulatory Assets and Regulatory Liabilities consist of (a):       
Amounts recognized in Regulatory Assets consist of (refer to Note 2 for details):
       
Net actuarial loss
$233.5
 
$152.2
 
$26.3
 
$18.3

$236.1
 
$232.1
 
$21.5
 
$23.3
Prior service credit(1.0) (0.7) (5.6) (9.5)(1.4) (1.2) (1.5) (2.4)

$232.5
 
$151.5
 
$20.7
 
$8.8

$234.7
 
$230.9
 
$20.0
 
$20.9

(a)
Refer to Note 2 for amounts recognized in “Regulatory assets” on WPL’s balance sheets. At December 31, 2014 and 2013, $1.1 million and $1.1 million, respectively, of regulatory liabilities were recognized related to WPL’s OPEB plans.

Included in the following tables are accumulated benefit obligations, aggregate amounts applicable to defined benefit pension and OPEB plans with accumulated benefit obligations in excess of plan assets, as well as defined benefit pension plans with projected benefit obligations in excess of plan assets as of the December 31 measurement date (in millions):
 Defined Benefit  
 Pension Plans OPEB Plans
Alliant Energy2014 2013 2014 2013
Accumulated benefit obligations
$1,255.0
 
$1,071.7
 
$231.1
 
$208.7
Plans with accumulated benefit obligations in excess of plan assets:       
Accumulated benefit obligations1,255.0
 406.5
 231.1
 208.7
Fair value of plan assets1,018.1
 347.6
 121.6
 124.9
Plans with projected benefit obligations in excess of plan assets:       
Projected benefit obligations1,301.5
 1,113.4
 N/A
 N/A
Fair value of plan assets1,018.1
 1,022.9
 N/A
 N/A

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 Defined Benefit  
 Pension Plans OPEB Plans
Alliant Energy2016 2015 2016 2015
Accumulated benefit obligations
$1,201.5
 
$1,166.0
 
$220.1
 
$221.4
Plans with accumulated benefit obligations in excess of plan assets:       
Accumulated benefit obligations1,201.5
 1,166.0
 220.1
 221.4
Fair value of plan assets895.7
 895.0
 105.8
 106.9
Plans with projected benefit obligations in excess of plan assets:       
Projected benefit obligations1,244.3
 1,206.3
 N/A
 N/A
Fair value of plan assets895.7
 895.0
 N/A
 N/A


 Defined Benefit  
 Pension Plans OPEB Plans
IPL2014 2013 2014 2013
Accumulated benefit obligations
$575.5
 
$491.5
 
$96.4
 
$87.8
Plans with accumulated benefit obligations in excess of plan assets:       
Accumulated benefit obligations575.5
 159.3
 96.4
 87.8
Fair value of plan assets484.7
 144.6
 78.7
 81.2
Plans with projected benefit obligations in excess of plan assets:       
Projected benefit obligations603.1
 514.0
 N/A
 N/A
Fair value of plan assets484.7
 485.9
 N/A
 N/A
Defined Benefit  Defined Benefit  
Pension Plans OPEB PlansPension Plans OPEB Plans
WPL2014 2013 2014 2013
IPL2016 2015 2016 2015
Accumulated benefit obligations
$532.5
 
$446.7
 
$94.0
 
$85.6

$546.7
 
$531.0
 
$90.1
 
$91.3
Plans with accumulated benefit obligations in excess of plan assets:              
Accumulated benefit obligations532.5
 115.6
 94.0
 85.6
546.7
 531.0
 90.1
 91.3
Fair value of plan assets440.3
 106.8
 21.8
 21.7
422.0
 422.7
 68.2
 69.2
Plans with projected benefit obligations in excess of plan assets:              
Projected benefit obligations547.6
 460.8
 N/A
 N/A
570.4
 556.1
 N/A
 N/A
Fair value of plan assets440.3
 438.8
 N/A
 N/A
422.0
 422.7
 N/A
 N/A
 Defined Benefit  
 Pension Plans OPEB Plans
WPL2016 2015 2016 2015
Accumulated benefit obligations
$513.2
 
$493.8
 
$88.9
 
$89.7
Plans with accumulated benefit obligations in excess of plan assets:       
Accumulated benefit obligations513.2
 493.8
 88.9
 89.7
Fair value of plan assets389.7
 386.8
 18.6
 18.7
Plans with projected benefit obligations in excess of plan assets:       
Projected benefit obligations529.2
 505.9
 N/A
 N/A
Fair value of plan assets389.7
 386.8
 N/A
 N/A

In addition to the amounts recognized in “Regulatoryregulatory assets and regulatory liabilities” in the above tables for IPL and WPL, “Regulatory assets” and “Regulatory liabilities”regulatory assets were recognized for amounts associated with Corporate Services employees participating in other Alliant Energy sponsored benefit plans that were allocated to IPL and WPL at December 31 as follows (in millions):
 IPL WPL
 2014 2013 2014 2013
Regulatory assets
$38.2
 
$26.5
 
$28.0
 
$19.8
Regulatory liabilities
 1.7
 
 1.3
 IPL WPL
 2016 2015 2016 2015
Regulatory assets
$37.3
 
$38.0
 
$30.0
 
$29.5

Estimated Future Employer Contributions and Benefit Payments - Estimated funding for the qualified and non-qualified defined benefit pension and OPEB plans for 20152017 is as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
Defined benefit pension plans (a)
$2.5
 
$0.8
 
$0.2

$6.5
 
$0.7
 
$0.1
OPEB plans5.7
 
 5.5
8.7
 2.0
 6.4

(a)Alliant Energy sponsors several non-qualified defined benefit pension plans that cover certain current and former key employees of IPL and WPL. Alliant Energy allocates pension costs to IPL and WPL for these plans. In addition, IPL and WPL amounts reflect funding for their non-bargaining employees who are participants in the Alliant Energy and Corporate Services sponsored qualified and non-qualified defined benefit pension plans.

Expected benefit payments for the qualified and non-qualified defined benefit plans, which reflect expected future service, as appropriate, are as follows (in millions):
Alliant Energy2015 2016 2017 2018 2019 2020 - 20242017 2018 2019 2020 2021 2022 - 2026
Defined benefit pension benefits
$66.7
 
$71.5
 
$69.3
 
$72.9
 
$73.6
 
$396.1

$74.8
 
$73.2
 
$75.5
 
$77.6
 
$79.9
 
$405.9
OPEB17.6
 16.8
 16.7
 16.9
 17.0
 84.0
18.6
 18.5
 18.2
 17.8
 17.6
 82.6

$84.3
 
$88.3
 
$86.0
 
$89.8
 
$90.6
 
$480.1

$93.4
 
$91.7
 
$93.7
 
$95.4
 
$97.5
 
$488.5
IPL2015 2016 2017 2018 2019 2020 - 20242017 2018 2019 2020 2021 2022 - 2026
Defined benefit pension benefits
$30.4
 
$31.6
 
$33.1
 
$34.9
 
$34.7
 
$189.9

$34.0
 
$35.1
 
$35.0
 
$37.2
 
$37.9
 
$192.1
OPEB7.4
 7.2
 7.2
 7.2
 7.2
 35.3
7.7
 7.6
 7.4
 7.4
 7.2
 34.0

$37.8
 
$38.8
 
$40.3
 
$42.1
 
$41.9
 
$225.2

$41.7
 
$42.7
 
$42.4
 
$44.6
 
$45.1
 
$226.1

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WPL2015 2016 2017 2018 2019 2020 - 20242017 2018 2019 2020 2021 2022 - 2026
Defined benefit pension benefits
$28.4
 
$28.0
 
$28.8
 
$30.1
 
$30.5
 
$163.4

$30.2
 
$30.9
 
$31.8
 
$32.5
 
$32.4
 
$167.1
OPEB7.7
 7.0
 7.0
 7.0
 7.1
 34.2
8.0
 8.0
 7.8
 7.4
 7.3
 32.7

$36.1
 
$35.0
 
$35.8
 
$37.1
 
$37.6
 
$197.6

$38.2
 
$38.9
 
$39.6
 
$39.9
 
$39.7
 
$199.8

Investment Policy and Strategy for Plan Assets - Investment policies and strategies employed with respect to assets of defined benefit pension and OPEB plans are to combine both preservation of principal and prudent and reasonable risk-taking to protect the integrity of plan assets, in order to meet the obligations to plan participants while minimizing benefit costs over the long term. It is recognized that risk and volatility are present with all types of investments. However, risk is mitigated at the total fund level through diversification by asset class including U.S. and international equity and fixed income exposure, global asset and risk parity strategies, the number of individual investments, and sector and industry limits. Global asset and risk parity strategies include investments in global equity, global debt, commodities and currencies.

Defined Benefit Pension PlansPlan Assets - For assets of defined benefit pension plans, the mix among asset classes is controlled by asset allocation targets. Historical performance results and future expectations suggest that equity securities will provide higher total investment returns than debt securities over a long-term investment horizon. Consistent with the goals of meeting obligations to plan participants and minimizing benefit costs over the long-term, the defined benefit pension plans have a long-term investment posture more heavily weighted towards equity holdings. The asset allocation is monitored regularly and appropriate steps are taken as needed to rebalance the assets within the prescribed ranges. An overlay management service is also used to help maintain target allocations and meet liquidity needs. The overlay manager is authorized to use derivative financial instruments to facilitate this service. For separately managed accounts, prohibited investment vehicles include, but may not be limited to, direct ownership of real estate, margin trading, oil and gas limited partnerships and securities of the managers’ firms or affiliate firms.

At December 31, 20142016, the current target ranges and actual allocations for the defined benefit pension plan assets were as follows:
 Target Range Actual
 Allocation Allocation
Cash and equivalents0%-5% 5%
Equity securities:     
U.S. large cap core8%-18% 13%
U.S. large cap value2.5%-12.5% 7%
U.S. large cap growth2.5%-12.5% 7%
U.S. small cap value0%-4% 1%
U.S. small cap growth0%-4% 2%
International - developed markets7%-19% 10%
International - emerging markets0%-10% 5%
Global asset allocation securities5%-15% 10%
Risk parity allocation securities5%-15% 10%
Fixed income securities20%-40% 30%
 Target Range Actual
 Allocation Allocation
Cash and equivalents0%-5% 3%
Equity securities - domestic22%-42% 30%
Equity securities - international8%-28% 17%
Global asset allocation securities5%-15% 10%
Risk parity allocation securities5%-15% 10%
Fixed income securities20%-40% 30%


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Other Postretirement Benefits PlansPlan Assets - OPEB plansplan assets are comprised of specific assets within certain defined benefit pension plans (401(h) assets) as well as assets held in VEBA trusts. The investment policy and strategy of the 401(h) assets, except for the WPL 401(h) assets, mirrors those of the defined benefit pension plans, which are discussed above. For VEBA trusts with assets greater than $5 million, and the WPL 401(h) assets, the mix among asset classes is controlled by allocation targets. The asset allocation is monitored regularly and appropriate steps are taken as needed to rebalance the assets within the prescribed ranges. Mutual funds are used to achieve the desired diversification. At December 31, 20142016, the current target ranges and actual allocations for VEBA trusts with assets greater than $5 million and the WPL 401(h) assets were as follows:
Target Range ActualTarget Range Actual
Allocation AllocationAllocation Allocation
Cash and equivalents0%-5% 2%0%-15% 3%
Equity securities:  
Domestic25%-45% 36%
International10%-20% 14%
Equity securities - domestic0%-45% 22%
Equity securities - international0%-21% 13%
Global asset allocation securities20%-40% 29%5%-40% 16%
Fixed income securities10%-30% 19%10%-70% 46%

Fair Value Measurements - The following tables report a framework for measuring fair value. TheFair value measurement accounting establishes three levels of fair value hierarchy prioritizesthat prioritize the inputs to valuation techniques used to measure fair value. The threeRefer to Note 14 for discussion of levels ofwithin the fair value hierarchy and examples of each are as follows:

hierarchy. Level 1 - Pricing inputs are quoted prices available in active markets for identical assets or liabilities as of the reporting date. Investmentsitems include investments in securities held in registered investment companies, treasury bills and directly held equity securities, which are valued at the closing price reported in the active market in which the securities are traded.

Level 2 - Pricing inputs are quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liabilityitems include fixed income securities consisting of corporate and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Investments in common/collective trusts are valued at the net asset value of shares held by the plans, which is based on the fair market value of the underlying investments in the common/collective trusts. Investments in corporategovernment bonds and government and agency obligations, which are valued at the closing price reported in the active market for similar assets in which the individual securities are traded or based on yields currently available on comparable securities of issuers with similar credit ratings.

Level 3 - Pricing inputs Certain investments that are unobservable inputs for assets or liabilities for which little or no market data exist and require significant management judgment or estimation.

Themeasured at fair value hierarchy givesusing the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fairnet asset value might fall in different levels of the fair value hierarchy. The lowest level input that is significant to a fair value measurement in its entirety determines the applicable levelpractical expedient have not been classified in the fair value hierarchy. AssessingThese fair value amounts are included in the significance of a particular inputtables below to reconcile the fair value measurement in its entirety requires judgment, considering factors specifichierarchy to the asset or liability.respective total plan assets.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while Alliant Energy, IPL and WPL believe their valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.


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At December 31, the fair values of Alliant Energy’s qualified and non-qualified defined benefit pension plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$49.3
 
$—
 
$49.3
 
$—
 
$32.6
 
$—
 
$32.6
 
$—
Equity securities:               
U.S. large cap core137.2
 137.2
 
 
 134.1
 134.1
 
 
U.S. large cap value72.2
 
 72.2
 
 77.0
 
 77.0
 
U.S. large cap growth73.2
 
 73.2
 
 77.4
 
 77.4
 
U.S. small cap value15.2
 
 15.2
 
 20.7
 
 20.7
 
U.S. small cap growth15.9
 15.9
 
 
 20.8
 20.8
 
 
International - developed markets102.9
 52.1
 50.8
 
 136.3
 68.0
 68.3
 
International - emerging markets47.2
 47.2
 
 
 48.4
 48.4
 
 
Global asset allocation securities99.9
 57.2
 42.7
 
 99.1
 56.7
 42.4
 
Risk parity allocation securities102.5
 
 102.5
 
 96.1
 
 96.1
 
Fixed income securities:               
Corporate bonds0.1
 
 0.1
 
 29.2
 
 29.2
 
Government and agency obligations
 
 
 
 49.1
 
 49.1
 
Fixed income funds302.7
 0.2
 302.5
 
 202.2
 0.2
 202.0
 
 1,018.3
 
$309.8
 
$708.5
 
$—
 1,023.0
 
$328.2
 
$694.8
 
$—
Accrued investment income0.1
       0.7
      
Due to brokers, net (pending trades with brokers)(0.3)       (0.8)      
Total pension plan assets
$1,018.1
       
$1,022.9
      
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$30.4
 
$5.0
 
$25.4
 
$—
 
$23.1
 
$—
 
$23.1
 
$—
Equity securities - domestic183.6
 183.6
 
 
 116.4
 116.4
 
 
Equity securities - international97.4
 97.4
 
 
 93.9
 93.9
 
 
Global asset allocation securities53.0
 53.0
 
 
 52.9
 52.9
 
 
Fixed income securities125.4
 53.6
 71.8
 
 
 
 
 
Total assets in fair value hierarchy489.8
 
$392.6
 
$97.2
 
$—
 286.3
 
$263.2
 
$23.1
 
$—
Assets measured at net asset value405.9
       608.5
      
Accrued investment income1.1
       0.2
      
Due to brokers, net (pending trades with brokers)(1.1)       
      
Total pension plan assets
$895.7
       
$895.0
      

At December 31, the fair values of IPL’s qualified and non-qualified defined benefit pension plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$23.5
 
$—
 
$23.5
 
$—
 
$15.4
 
$—
 
$15.4
 
$—
Equity securities:               
U.S. large cap core65.3
 65.3
 
 
 63.7
 63.7
 
 
U.S. large cap value34.4
 
 34.4
 
 36.6
 
 36.6
 
U.S. large cap growth34.9
 
 34.9
 
 36.8
 
 36.8
 
U.S. small cap value7.2
 
 7.2
 
 9.8
 
 9.8
 
U.S. small cap growth7.6
 7.6
 
 
 9.9
 9.9
 
 
International - developed markets49.0
 24.8
 24.2
 
 64.8
 32.3
 32.5
 
International - emerging markets22.5
 22.5
 
 
 23.0
 23.0
 
 
Global asset allocation securities47.5
 27.2
 20.3
 
 47.1
 27.0
 20.1
 
Risk parity allocation securities48.8
 
 48.8
 
 45.7
 
 45.7
 
Fixed income securities:               
Corporate bonds
 
 
 
 13.9
 
 13.9
 
Government and agency obligations
 
 
 
 23.3
 
 23.3
 
Fixed income funds144.1
 0.1
 144.0
 
 96.1
 0.1
 96.0
 
 484.8
 
$147.5
 
$337.3
 
$—
 486.1
 
$156.0
 
$330.1
 
$—
Accrued investment income0.1
       0.2
      
Due to brokers, net (pending trades with brokers)(0.2)       (0.4)      
Total pension plan assets
$484.7
       
$485.9
      
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$14.4
 
$2.4
 
$12.0
 
$—
 
$10.9
 
$—
 
$10.9
 
$—
Equity securities - domestic86.5
 86.5
 
 
 54.9
 54.9
 
 
Equity securities - international45.9
 45.9
 
 
 44.4
 44.4
 
 
Global asset allocation securities24.9
 24.9
 
 
 25.0
 25.0
 
 
Fixed income securities59.1
 25.3
 33.8
 
 
 
 
 
Total assets in fair value hierarchy230.8
 
$185.0
 
$45.8
 
$—
 135.2
 
$124.3
 
$10.9
 
$—
Assets measured at net asset value191.2
       287.4
      
Accrued investment income0.5
       0.1
      
Due to brokers, net (pending trades with brokers)(0.5)       
      
Total pension plan assets
$422.0
       
$422.7
      


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At December 31, the fair values of WPL’s qualified and non-qualified defined benefit pension plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$21.3
 
$—
 
$21.3
 
$—
 
$14.0
 
$—
 
$14.0
 
$—
Equity securities:               
U.S. large cap core59.3
 59.3
 
 
 57.5
 57.5
 
 
U.S. large cap value31.3
 
 31.3
 
 33.1
 
 33.1
 
U.S. large cap growth31.7
 
 31.7
 
 33.2
 
 33.2
 
U.S. small cap value6.6
 
 6.6
 
 8.9
 
 8.9
 
U.S. small cap growth6.9
 6.9
 
 
 8.9
 8.9
 
 
International - developed markets44.5
 22.5
 22.0
 
 58.5
 29.2
 29.3
 
International - emerging markets20.4
 20.4
 
 
 20.8
 20.8
 
 
Global asset allocation securities43.2
 24.8
 18.4
 
 42.5
 24.3
 18.2
 
Risk parity allocation securities44.3
 
 44.3
 
 41.2
 
 41.2
 
Fixed income securities:               
Corporate bonds
 
 
 
 12.5
 
 12.5
 
Government and agency obligations
 
 
 
 21.0
 
 21.0
 
Fixed income funds130.9
 0.1
 130.8
 
 86.8
 0.1
 86.7
 
 440.4
 
$134.0
 
$306.4
 
$—
 438.9
 
$140.8
 
$298.1
 
$—
Accrued investment income
       0.2
      
Due to brokers, net (pending trades with brokers)(0.1)       (0.3)      
Total pension plan assets
$440.3
       
$438.8
      
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$13.3
 
$2.2
 
$11.1
 
$—
 
$10.0
 
$—
 
$10.0
 
$—
Equity securities - domestic79.9
 79.9
 
 
 50.3
 50.3
 
 
Equity securities - international42.4
 42.4
 
 
 40.6
 40.6
 
 
Global asset allocation securities23.0
 23.0
 
 
 22.8
 22.8
 
 
Fixed income securities54.5
 23.3
 31.2
 
 
 
 
 
Total assets in fair value hierarchy213.1
 
$170.8
 
$42.3
 
$—
 123.7
 
$113.7
 
$10.0
 
$—
Assets measured at net asset value176.6
       263.0
      
Accrued investment income0.5
       0.1
      
Due to brokers, net (pending trades with brokers)(0.5)       
      
Total pension plan assets
$389.7
       
$386.8
      


At December 31, the fair values of Alliant Energy’s OPEB plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$3.7
 
$—
 
$3.7
 
$—
 
$3.9
 
$—
 
$3.9
 
$—
Equity securities:               
U.S. blend35.8
 35.8
 
 
 36.8
 36.8
 
 
U.S. large cap core2.9
 2.9
 
 
 2.9
 2.9
 
 
U.S. large cap value1.5
 
 1.5
 
 1.7
 
 1.7
 
U.S. large cap growth1.6
 
 1.6
 
 1.7
 
 1.7
 
U.S. small cap value0.3
 
 0.3
 
 0.5
 
 0.5
 
U.S. small cap growth0.4
 0.4
 
 
 0.5
 0.5
 
 
International - blend14.2
 14.2
 
 
 15.4
 15.4
 
 
International - developed markets2.2
 1.1
 1.1
 
 3.0
 1.5
 1.5
 
International - emerging markets1.0
 1.0
 
 
 1.1
 1.1
 
 
Global asset allocation securities30.3
 29.4
 0.9
 
 30.4
 29.5
 0.9
 
Risk parity allocation securities2.2
 
 2.2
 
 2.1
 
 2.1
 
Fixed income securities:               
Corporate bonds
 
 
 
 0.6
 
 0.6
 
Government and agency obligations
 
 
 
 1.1
 
 1.1
 
Fixed income funds25.5
 19.0
 6.5
 
 23.2
 18.8
 4.4
 
Total OPEB plan assets
$121.6
 
$103.8
 
$17.8
 
$—
 
$124.9
 
$106.5
 
$18.4
 
$—
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$3.5
 
$2.0
 
$1.5
 
$—
 
$3.6
 
$—
 
$3.6
 
$—
Equity securities - domestic22.5
 22.5
 
 
 22.1
 22.1
 
 
Equity securities - international13.5
 13.5
 
 
 13.4
 13.4
 
 
Global asset allocation securities16.5
 16.5
 
 
 16.0
 16.0
 
 
Fixed income securities46.8
 46.2
 0.6
 
 46.3
 46.3
 
 
Total assets in fair value hierarchy102.8
 
$100.7
 
$2.1
 
$—
 101.4
 
$97.8
 
$3.6
 
$—
Assets measured at net asset value3.0
       5.5
      
Total OPEB plan assets
$105.8
       
$106.9
      


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At December 31, the fair values of IPL’s OPEB plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$1.4
 
$—
 
$1.4
 
$—
 
$1.5
 
$—
 
$1.5
 
$—
Equity securities:               
U.S. blend27.2
 27.2
 
 
 27.8
 27.8
 
 
U.S. large cap core0.5
 0.5
 
 
 0.7
 0.7
 
 
U.S. large cap value0.3
 
 0.3
 
 0.4
 
 0.4
 
U.S. large cap growth0.3
 
 0.3
 
 0.4
 
 0.4
 
U.S. small cap value0.1
 
 0.1
 
 0.1
 
 0.1
 
U.S. small cap growth0.1
 0.1
 
 
 0.1
 0.1
 
 
International - blend10.7
 10.7
 
 
 11.6
 11.6
 
 
International - developed markets0.4
 0.2
 0.2
 
 0.8
 0.4
 0.4
 
International - emerging markets0.2
 0.2
 
 
 0.3
 0.3
 
 
Global asset allocation securities21.6
 21.5
 0.1
 
 21.6
 21.4
 0.2
 
Risk parity allocation securities0.4
 
 0.4
 
 0.5
 
 0.5
 
Fixed income securities:               
Corporate bonds
 
 
 
 0.1
 
 0.1
 
Government and agency obligations
 
 
 
 0.3
 
 0.3
 
Fixed income funds15.5
 14.3
 1.2
 
 15.0
 13.9
 1.1
 
Total OPEB plan assets
$78.7
 
$74.7
 
$4.0
 
$—
 
$81.2
 
$76.2
 
$5.0
 
$—
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$0.8
 
$0.8
 
$—
 
$—
 
$0.9
 
$—
 
$0.9
 
$—
Equity securities - domestic17.0
 17.0
 
 
 16.7
 16.7
 
 
Equity securities - international11.0
 11.0
 
 
 10.8
 10.8
 
 
Global asset allocation securities7.0
 7.0
 
 
 6.9
 6.9
 
 
Fixed income securities32.4
 32.4
 
 
 33.3
 33.3
 
 
Total assets in fair value hierarchy68.2
 
$68.2
 
$—
 
$—
 68.6
 
$67.7
 
$0.9
 
$—
Assets measured at net asset value
       0.6
      
Total OPEB plan assets
$68.2
       
$69.2
      

At December 31, the fair values of WPL’s OPEB plansplan assets by asset category and fair value hierarchy level were as follows (in millions):
 2014 2013
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$1.4
 
$—
 
$1.4
 
$—
 
$1.4
 
$—
 
$1.4
 
$—
Equity securities:               
U.S. blend3.6
 3.6
 
 
 3.6
 3.6
 
 
U.S. large cap core1.6
 1.6
 
 
 1.5
 1.5
 
 
U.S. large cap value0.8
 
 0.8
 
 0.8
 
 0.8
 
U.S. large cap growth0.8
 
 0.8
 
 0.8
 
 0.8
 
U.S. small cap value0.2
 
 0.2
 
 0.2
 
 0.2
 
U.S. small cap growth0.2
 0.2
 
 
 0.2
 0.2
 
 
International - blend1.4
 1.4
 
 
 1.5
 1.5
 
 
International - developed markets1.2
 0.6
 0.6
 
 1.5
 0.7
 0.8
 
International - emerging markets0.5
 0.5
 
 
 0.5
 0.5
 
 
Global asset allocation securities3.8
 3.3
 0.5
 
 3.8
 3.3
 0.5
 
Risk parity allocation securities1.1
 
 1.1
 
 1.1
 
 1.1
 
Fixed income securities:               
Corporate bonds
 
 
 
 0.3
 
 0.3
 
Government and agency obligations
 
 
 
 0.5
 
 0.5
 
Fixed income funds5.2
 1.8
 3.4
 
 4.0
 1.8
 2.2
 
Total OPEB plan assets
$21.8
 
$13.0
 
$8.8
 
$—
 
$21.7
 
$13.1
 
$8.6
 
$—
 2016 2015
 Fair Level Level Level Fair Level Level Level
 Value 1 2 3 Value 1 2 3
Cash and equivalents
$2.0
 
$0.7
 
$1.3
 
$—
 
$2.3
 
$—
 
$2.3
 
$—
Global asset allocation securities5.5
 5.5
 
 
 5.4
 5.4
 
 
Fixed income securities11.1
 11.1
 
 
 11.0
 11.0
 
 
Total OPEB plan assets
$18.6
 
$17.3
 
$1.3
 
$—
 
$18.7
 
$16.4
 
$2.3
 
$—

For the various defined benefit pension and OPEB plans, Alliant Energy common stock represented less than 1% of assets directly held in the plans at December 31, 20142016 and 2013.

Cash Balance Plan - Alliant Energy’s defined benefit pension plans include the Cash Balance Plan, which provides benefits for certain non-bargaining unit employees. The Cash Balance Plan has been closed to new hires since 2005. Effective 2008, Alliant Energy amended the Cash Balance Plan by discontinuing additional contributions into employees’ Cash Balance Plan accounts and increased its level of contributions to its 401(k) Savings Plan. In 2009, Alliant Energy amended the Cash Balance Plan by changing participants’ future interest credit formula to use the annual change in the consumer price index.

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This amendment provides participants an interest crediting rate that is 3% more than the annual change in the consumer price index.

In 2008, a class-action lawsuit was filed against the Cash Balance Plan. The complaint alleged that certain Cash Balance Plan participants who received distributions prior to their normal retirement age did not receive the full benefit to which they were entitled in violation of the Employee Retirement Income Security Act of 1974 because the Cash Balance Plan applied an improper interest crediting rate to project the cash balance account to their normal retirement age. These Cash Balance Plan participants were limited to individuals who, prior to normal retirement age, received a lump-sum distribution or an annuity payment.

The Cash Balance Plan entered into a stipulation agreement with the plaintiffs, which was filed with the Court in 2013 settling all open matters in the case. In January 2014, the Court entered final judgment in the total amount of $9.0 million. Plaintiffs’ attorney’s fees and costs were paid from the final damages. Due to the stipulation agreement filed with the Court in 2013, Alliant Energy, IPL and WPL recognized the additional benefits to be paid to the plaintiffs in their income statements in 2013. As a result of the January 2014 final Court order requiring plaintiffs’ attorney’s fees and costs to be paid out of the final judgment, Alliant Energy, IPL and WPL reversed the reserve previously recorded related to payment of plaintiffs’ attorney’s fees and costs. As a result of recognizing the additional benefits of $9.0 million to be paid to the plaintiffs and reversing the previously recorded reserve of $6.7 million for plaintiffs’ attorney’s fees and costs, there was not a net material impact on Alliant Energy’s, IPL’s or WPL’s results of operations for 2013.2015.

401(k) Savings Plans - A significant number of employees participate in defined contribution retirement plans (401(k) savings plans). Alliant Energy common stock directly held by participants represented 12.6% and 11.3%11.6% of total assets held in the 401(k) savings plans at December 31, 20142016 and 20132015, respectively. Costs related to the 401(k) savings plans, which are partially based on the participants’ contributions and include allocated costs associated with Corporate Services employees for IPL and WPL, were as follows (in millions):
 Alliant Energy IPL (a) WPL (a)
 2014 2013 2012 2014
 2013
 2012
 2014 2013 2012
401(k) costs
$22.5
 
$19.2
 
$18.5
 
$11.1
 
$9.9
 
$9.6
 
$10.5
 
$8.5
 
$8.1
 Alliant Energy IPL WPL
 2016 2015 2014 2016
 2015
 2014
 2016 2015 2014
401(k) costs
$23.6
 
$24.9
 
$22.5
 
$12.0
 
$12.7
 
$11.1
 
$10.7
 
$11.2
 
$10.5

(a)IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees.
Voluntary Employee Separation Charges - In 2015, Alliant Energy offered certain employees a voluntary separation package. Approximately 2% of total Alliant Energy employees accepted this package, which resulted in Alliant Energy, IPL and WPL recording charges of $8 million, $5 million and $3 million, respectively, in 2015.

(b)NOTE 12(b) Equity-based Compensation Plans - All shares, units and awards included below have been adjusted to reflect the common stock split discussed in Note 7.

In 2010,2015, Alliant Energy’s shareowners approved the Amended and Restated OIP, which permits the grant of shares of Alliant Energy common stock, options, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards and performance-based cash

or cash-based awards to key employees. At December 31, 2014,2016, performance shares, performance-contingent restricted stock and restricted stock units (performance- and time-based) were outstanding under the Amended and 3.9Restated OIP, and 7.4 million shares of Alliant Energy’s common stock remained available for grants under the Amended and Restated OIP. Alliant Energy satisfies share payouts related to equity awards under the Amended and Restated OIP through the issuance of new shares of its common stock. Alliant Energy also has the DLIP, which permits the grant of cash-based long-term performance-based awards, including performance units, and restricted cash awards and restricted units, to certain key employees. At December 31, 20142016, performance units, and performance contingentperformance-contingent cash awards and restricted units (performance- and time-based) were outstanding under the DLIP. There is no limit to the number of grants that can be made under the DLIP and Alliant Energy satisfies all payouts under the DLIP through cash payments. Nonvested awards generally do not have non-forfeitable rights to dividends or dividend equivalents when dividends are paid to common shareowners.

A summary of compensation expense, (includingincluding amounts allocated to IPL and WPL)WPL, and the related income tax benefits recognized for share-based compensation awards was as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2012 2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014 2016 2015 2014
Compensation expense
$15.3
 
$12.0
 
$6.9
 
$8.3
 
$6.2
 
$3.6
 
$6.4
 
$5.2
 
$3.0

$18.0
 
$10.7
 
$15.3
 
$9.5
 
$5.7
 
$8.3
 
$7.9
 
$4.7
 
$6.4
Income tax benefits6.2
 4.8
 2.8
 3.4
 2.5
 1.5
 2.6
 2.1
 1.2
7.4
 4.4
 6.2
 4.0
 2.4
 3.4
 3.2
 1.9
 2.6

As of December 31, 2014,2016, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $6.5$5.0 million,, $2.7 million and $2.2 million, respectively, which is expected to be recognized over a weighted average period of between 1 and 2 years. Share-based compensation expense is recognized on a straight-line basis over the requisite service periods and is primarily recorded in “Utility - Other“Other operation and maintenance” in the income statements.

Performance Shares and Performance Units - Payouts of performance shares under the Amended and Restated OIP and performance units under the DLIP to key employees are contingent upon achievement over 3three-year periods of specified performance criteria, which currently include metrics of total shareowner return relative to an investor-owned utility peer group. Payouts of nonvested performance shares and units are based on achievement of the performance criteria and are prorated at retirement, death or disability based on time worked during the first year of the performance period and prorated at involuntary termination without cause based on time worked during the entire performance period. Upon achievement of the performance criteria, payouts of these performance shares and units to

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participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested performance shares and units are forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause. Nonvested performance shares and units do not have non-forfeitable rights to dividends when dividends are paid to common shareowners. Alliant Energy assumes it will make future payouts of its performance shares and units in cash; therefore, performance shares and units are accounted for as liability awards.

Performance Shares - Performance shares can be paid out in shares of Alliant Energy’s common stock, cash or a combination of cash and stockstock. Performance units must be paid out in cash. Alliant Energy assumes it will make future payouts of its performance shares and performance units in cash; therefore, performance shares and performance units are adjusted by a performance multiplier, which ranges from zero to 200% based on the performance criteria.accounted for as liability awards. A summary of the performance shares and performance units activity, with amounts representing the target number of awards, was as follows:
2014 2013 2012Performance Shares Performance Units
Shares (a) Shares (a) Shares (a)2016 2015 2014 2016 2015 2014
Nonvested shares, January 1139,940
 145,277
 236,979
Nonvested awards, January 1288,430
 288,848
 279,880
 116,412
 127,330
 131,824
Granted51,221
 49,093
 45,612
68,585
 90,806
 102,442
 23,918
 35,674
 40,844
Vested(45,235) (54,430) (111,980)(98,186) (91,224) (90,470) (42,760) (45,690) (41,502)
Forfeited (b)(1,502) 
 (25,334)(1,230) 
 (3,004) (4,250) (902) (3,836)
Nonvested shares, December 31144,424
 139,940
 145,277
Nonvested awards, December 31257,599
 288,430
 288,848
 93,320
 116,412
 127,330

(a)
Share amounts represent the target number of performance shares. Each performance share’s value is based on the closing market price of one
Granted Awards - Each performance share’s value is based on the closing market price of one share of Alliant Energy’s common stock at the end of the performance period. For performance units granted in 2016, the value is based on the closing market price of one share of Alliant Energy’s common stock at the end of the performance period. For performance units granted in 2015 and 2014, each performance unit’s value is based on the closing market price of one share of Alliant Energy’s common stock on the grant date of the award. The actual payout for performance shares and performance units is dependent upon actual performance and may range from zero to 200% of the target number of awards. Compensation expense for performance shares and performance units is recorded ratably over the performance period based on the fair value of the awards at each reporting period. The actual number of shares that will be paid out upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
(b)Forfeitures were primarily caused by retirements and voluntary terminations of participants.


Vested Awards -Certain performance shares and performance units vested, resulting in payouts (a combination of cash and common stock) as follows:
 2014 2013 2012
 2011 Grant 2010 Grant 2009 Grant
Performance shares vested45,235
 54,430
 111,980
Percentage of target number of performance shares147.5% 197.5% 162.5%
Aggregate payout value (in millions)
$3.4
 
$4.8
 
$8.0
Payout - cash (in millions)
$2.9
 
$4.4
 
$7.8
Payout - common stock shares issued4,810
 4,177
 6,399

Performance Units - Performance units must be paid out in cash and are adjusted by a performance multiplier, which ranges from zero to 200% based onstock for the performance criteria. A summary ofshares and cash only for the performance unit activity wasunits) as follows:
 2014 2013 2012
 Units (a) Units (a) Units (a)
Nonvested units, January 165,912
 64,969
 42,996
Granted20,422
 22,201
 24,686
Vested(20,751) (19,760) 
Forfeited(1,918) (1,498) (2,713)
Nonvested units, December 3163,665
 65,912
 64,969
 Performance Shares Performance Units
 2016 2015 2014 2016 2015 2014
 2013 Grant 2012 Grant 2011 Grant 2013 Grant 2012 Grant 2011 Grant
Performance awards vested98,186 91,224 90,470 42,760 45,690 41,502
Percentage of target number of performance awards165.0% 167.5% 147.5% 165.0% 167.5% 147.5%
Aggregate payout value (in millions)$5.1 $5.1 $3.4 $1.7 $1.6 $1.2
Payout - cash (in millions)$2.9 $3.2 $2.9 $1.7 $1.6 $1.2
Payout - common stock shares issued22,408 21,950 9,620 N/A N/A N/A

(a)
Unit amounts represent the target number of performance units. Each performance unit’s value is based on the average price of one share of Alliant Energy’s common stock on the grant date of the award. The actual payout for performance units is dependent upon actual performance and may range from zero to 200% of the target number of units.

Certain performance units vested, resulting in cash payouts as follows:
 2014 2013
 2011 Grant 2010 Grant
Performance units vested20,751
 19,760
Percentage of target number of performance units147.5% 197.5%
Payout value (in millions)
$1.2
 
$1.3


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Fair Value of Awards - Information related to fair values of nonvested performance shares and performance units at December 31, 20142016, by year of grant, were as follows:
Performance Shares Performance UnitsPerformance Shares Performance Units
2014 Grant 2013 Grant 2012 Grant 2014 Grant 2013 Grant 2012 Grant2016 Grant 2015 Grant 2014 Grant 2016 Grant 2015 Grant 2014 Grant
Nonvested awards49,719
 49,093
 45,612
 19,440
 21,380
 22,845
Alliant Energy common stock closing price on December 31, 2014
$66.42
 
$66.42
 
$66.42
      
Nonvested awards at target67,355
 90,806
 99,438
 22,657
 33,268
 37,395
Alliant Energy common stock closing price on December 30, 2016
$37.89
 
$37.89
 
$37.89
 
$37.89
 N/A N/A
Alliant Energy common stock closing price on grant date      
$53.77
 
$47.58
 
$43.05
N/A N/A N/A N/A 
$32.55
 
$26.89
Estimated payout percentage based on performance criteria125% 160% 168% 125% 160% 168%135% 155% 148% 135% 155% 148%
Fair values of each nonvested award
$83.03
 
$106.27
 
$111.25
 
$67.21
 
$76.13
 
$72.11

$51.15
 
$58.73
 
$56.08
 
$51.15
 
$50.45
 
$39.80

At December 31, 2014, fair values of nonvested performance shares and units were calculated using a Monte Carlo simulation to determine the anticipated total shareowner returns of Alliant Energy and its investor-owned utility peer group. Expected volatility was based on historical volatilities using daily stock prices over the past three years. Expected dividend yields were calculated based on the most recent quarterly dividend rates announced prior to the measurement date and stock prices at the measurement date. The risk-free interest rate was based on the three-year U.S. Treasury rate in effect as of the measurement date.

Performance-contingentPerformance-Contingent Restricted Stock - Vesting of performance-contingent restricted stock grants areis based on the achievement of certain performance targets (currently specified growth of consolidated income from continuing operations). If performance targets are not met within the performance period, which currently ranges from two to four years, these restricted stock grants are forfeited. Payouts of nonvested performance-contingent restricted stock are based on achievement of the performance criteria and are prorated at retirement, death or disability based on time worked during the first year of the performance period and prorated at involuntary termination without cause based on time worked during the entire performance period. Upon achievement of the performance criteria, payouts of this performance-contingent restricted stock to participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested performance-contingent restricted stock is forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause. The fair value of performance-contingent restricted stock is based on the closing market price on the grant date. A summary of the performance-contingent restricted stock activity was as follows:
2016 2015 2014
2014 2013 2012  Weighted Average   Weighted Average   Weighted Average
Shares 
Weighted
Average
Fair Value
 Shares 
Weighted
Average
Fair Value
 Shares 
Weighted
Average
Fair Value
Shares Grant Date Fair Value Shares Grant Date Fair Value Shares Grant Date Fair Value
Nonvested shares, January 1158,922
 
$42.71
 211,651
 
$32.42
 301,738
 
$32.60
190,244
 
$29.59
 197,624
 
$25.35
 317,844
 
$21.36
Granted51,221
 53.77
 49,093
 47.58
 45,612
 43.05

 
 90,806
 32.55
 102,442
 26.89
Vested (a)(90,847) 40.91
 
 
 (65,172) 32.56

 
 (98,186) 23.79
 (181,694) 20.46
Forfeited (b)(20,484) 39.85
 (101,822) 23.67
 (70,527) 39.93

 
 
 
 (40,968) 19.93
Nonvested shares, December 3198,812
 50.69
 158,922
 42.71
 211,651
 32.42
190,244
 29.59
 190,244
 29.59
 197,624
 25.35

(a)
In 2015, 98,186 performance-contingent restricted shares granted in 2013 vested because the specified performance criteria for such shares were met. In 2014, 45,61291,224 and 45,235 performance contingent90,470 performance-contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met. In 2012, 65,172 performance-contingent restricted shares granted in 2010 vested because the specified performance criteria for such shares were met.
(b)
In 2013 and 2012, 101,822 and 65,516 performance-contingent restricted shares granted in 2009 and 2008, respectively, were forfeited because the specified performance criteria for such shares were not met. The remaining forfeitures during 2014 and 2012 were primarily caused by retirements and terminations of participants.

Performance ContingentRestricted Stock Units and Performance Restricted Units - Alliant Energy granted new types of share-based compensation awards to key employees in 2016 referred to as performance restricted stock units under the Amended and Restated OIP, and performance restricted units and key employee performance restricted units under the DLIP. Payouts of these units are based on the achievement of certain performance targets (currently specified growth of consolidated income from continuing operations) during a three-year performance period. The actual number of units that will be paid out upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of units. If performance targets are not met during the performance period, these units are forfeited. As of December 31, 2016, the amount of nonvested performance restricted units and key employee performance restricted units was not material.

Performance Restricted Stock Units - Performance restricted stock units generally must be paid out in shares and are accounted for as equity awards. Each performance restricted stock unit’s value is based on the closing market price of one share of Alliant Energy’s common stock on the grant date of the award. Compensation expense is recorded ratably over the performance period based on a probability assessment of payouts for the awards at each reporting period. A summary of the performance restricted stock units activity, with amounts representing the target number of units, was as follows:

 2016
 Units 
Weighted Average
Grant Date Fair Value
Granted68,585
 
$33.96
Forfeited(1,230) 33.90
Nonvested units, December 3167,355
 33.96

Restricted Stock Units and Restricted Units - Alliant Energy granted new types of share-based compensation awards to key employees in 2016 referred to as restricted stock units under the Amended and Restated OIP and restricted units under the DLIP. Payouts of these units are based on the expiration of a three-year time-vesting period. Each restricted stock unit’s value is based on the closing market price of one share of Alliant Energy’s common stock at the end of the time-vesting period. Compensation expense is recorded ratably over the performance period based on the fair value of the awards at each reporting period. Restricted stock units can be paid out in shares of Alliant Energy common stock, cash or a combination of cash and stock. Alliant Energy assumes it will make future payouts of its restricted stock units in cash; therefore, restricted stock units are accounted for as liability awards. As of December 31, 2016, the amount of nonvested restricted units was not material. A summary of the restricted stock units activity was as follows:
2016
Granted58,790
Forfeited(1,054)
Nonvested units, December 3157,736

Performance-Contingent Cash Awards - Performance contingentPerformance-contingent cash award payouts to key employees are based on the achievement of certain performance targets (currently specified growth of consolidated income from continuing operations). If performance targets are not met within the performance period, which currently ranges from two to four years, there are no payouts for these awards. Payouts of nonvested awards are based on achievement of the performance criteria and are prorated at retirement, death or disability based on time worked during the first year of the performance period. Upon achievement of the performance criteria, payouts of these awards to participants who terminate employment after the first year of the performance period due to retirement, death or disability are not prorated. Participants’ nonvested awards are forfeited if the participant voluntarily leaves Alliant Energy or is terminated for cause. Each performance contingentperformance-contingent cash award’s value is based on the price of one share of Alliant Energy’s common stock at the end of the performance period.

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Alliant Energy accounts for performance contingentperformance-contingent cash awards as liability awards because payouts will be made in the form of cash. A summary of the performance contingentperformance-contingent cash awards activity was as follows:
2014 2013 2012
Awards Awards Awards2016 2015 2014
Nonvested awards, January 196,977
 59,639
 46,676
163,752
 157,860
 193,954
Granted42,446
 39,530
 36,936

 82,210
 84,892
Vested (a)(55,517) 
 (21,605)
 (74,664) (111,034)
Forfeited(4,976) (2,192) (2,368)(3,652) (1,654) (9,952)
Nonvested awards, December 3178,930
 96,977
 59,639
160,100
 163,752
 157,860

(a)
In 2015, 74,664 performance-contingent cash awards granted in 2013 vested, resulting in cash payouts valued at $2.4 million. In 2014, 34,76669,532 and 20,751 performance contingent41,502 performance-contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively. In 2012, 21,605 performance contingent cash awards granted in 2010 vested, resulting in cash payouts valued at $0.9 million.

(c)NOTE 12(c) Deferred Compensation Plan - Alliant Energy maintains a DCP under which key employees may defer up to 100% of base salary and performance-basedshort-term cash incentive compensation and directors may elect to defer all or part of their retainer and committee fees. Key employees who have made the maximum allowed contribution to the Alliant Energy 401(k) Savings Plan may receive an additional credit to the DCP. Key employees and directors may elect to have their deferrals credited to a company stock account, an interest account or equity accounts based on certain benchmark funds.

Company Stock Accounts - The DCP does not permit diversification of deferrals credited to the company stock account and all distributions from participants’ company stock accounts are made in the form of shares of Alliant Energy common stock. The deferred compensation obligations for participants’ company stock accounts are recorded in “Additional paid-in capital” and the shares of Alliant Energy common stock held in a rabbi trust to satisfy this obligation are recorded in “Shares in deferred compensation trust” on Alliant Energy’s balance sheets. At December 31, the carrying value of the deferred compensation obligation for the company stock accounts and the shares in the deferred compensation trust based on the historical value of the shares of Alliant Energy common stock contributed to the rabbi trust, and the fair market value of the shares held in the rabbi trust were as follows (in millions):
2014 20132016 2015
Carrying value
$8.9
 
$8.0

$10.0
 
$8.5
Fair market value15.9
 11.7
16.7
 13.4

Interest and Equity Accounts - Distributions from participants’ interest and equity accounts are in the form of cash payments. The deferred compensation obligations for participants’ interest and equity accounts are recorded in “Pension and other benefit obligations” on Alliant Energy’s and IPL’s balance sheets. At December 31, the carrying value of deferred compensation obligations for participants’ interest and equity accounts, which approximates fair market value, was as follows (in millions):
 Alliant Energy IPL
 2014 2013 2014 2013
Carrying value$17.8 $15.9 $5.2 $5.2
 Alliant Energy IPL
 2016 2015 2016 2015
Carrying value$19.4 $18.3 $4.6 $5.0

(13)NOTE 13. ASSET RETIREMENT OBLIGATIONS
Recognized AROs relate to legal obligations for the removal, closure or dismantlement of several assets including, but not limited to, wind projects, certain ash ponds, wind farms, active ash landfills, certain coal yards and above ground storage tanks. Recognized AROs also include legal obligations for the management and final disposition of asbestos, lead-based paint and polychlorinated biphenyls. AROs are recorded in “Other current liabilities” and “Other liabilities” on the balance sheets. Refer to Note 2 for information regarding regulatory assets related to AROs. A reconciliation of the changes in AROs associated with long-lived assets is as follows (in millions):

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Alliant Energy IPL WPLAlliant Energy IPL WPL
2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Balance, January 1
$109.7
 
$101.5
 
$47.9
 
$45.5
 
$52.4
 
$46.9

$214.0
 
$114.0
 
$132.9
 
$51.8
 
$71.9
 
$52.4
Revisions in estimated cash flows(a)
 5.6
 
 0.1
 
 5.5
(13.3) 17.3
 (5.8) 15.1
 (7.5) 3.2
Liabilities settled(3.4) (2.3) (1.4) (0.6) (2.0) (1.7)(14.0) (8.8) (6.8) (4.3) (7.2) (4.5)
Liabilities incurred(a)3.7
 1.2
 3.5
 1.2
 0.2
 
2.6
 86.6
 0.7
 67.8
 1.9
 18.8
Accretion expense4.0
 3.7
 1.8
 1.7
 1.8
 1.7
6.4
 4.9
 3.7
 2.5
 2.3
 2.0
Balance, December 31
$114.0
 
$109.7
 
$51.8
 
$47.9
 
$52.4
 
$52.4

$195.7
 
$214.0
 
$124.7
 
$132.9
 
$61.4
 
$71.9

(a)In April 2015, the EPA published the final CCR Rule, which regulates CCR as a non-hazardous waste and was effective October 2015. IPL and WPL have nine and three coal-fired EGUs, respectively, with coal ash ponds that are impacted by this rule. In addition, IPL and WPL have four and two active CCR landfills, respectively, that are impacted by this rule. In 2015, Alliant Energy, IPL and WPL recognized additional AROs of $87 million, $67 million and $20 million, respectively, as a result of the final CCR Rule. These increases in AROs resulted in corresponding increases in property, plant and equipment, net on the respective balance sheets. Actual costs resulting from the CCR Rule may be different than the amounts recorded in 2015 due to potential changes in compliance strategies that will be used, as well as other potential cost estimate changes. Expenditures incurred by IPL and WPL to comply with the CCR Rule are anticipated to be recovered in rates from their customers.

In addition, certain AROs related to EGU assets have not been recognized. Due to an indeterminate remediation date, the fair values of the AROs for these assets cannot be currently estimated. A liability for these AROs will be recorded when fair value is determinable. Removal costs of these EGUs are being recovered in rates and are recorded in regulatory liabilities.

In December 2014, the EPA issued the final CCR rule, which regulates CCR as a non-hazardous waste. IPL and WPL have current and former coal-fired EGUs with existing coal ash surface impoundments, as well as active CCR company-owned landfills that are impacted by this rule. Alliant Energy, IPL and WPL are currently evaluating the final rule to determine the full impact of the final CCR rule, including any additional AROs that may need to be recognized in 2015 as a result of this rule. Expenditures incurred by IPL and WPL to comply with the CCR rule are anticipated to be recovered in rates from their customers. Refer to Note 16(e) for further discussion of the final CCR rule.

(14)NOTE 14. FAIR VALUE MEASUREMENTS
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and the related estimated fair values of other financial instruments at December 31 were as follows (in millions):
 Alliant Energy IPL WPL
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
2014           
Assets:           
Derivative assets (Note 15)

$38.6
 
$38.6
 
$28.0
 
$28.0
 
$10.6
 
$10.6
Deferred proceeds (sales of receivables) (Note 5(b))
177.2
 177.2
 177.2
 177.2
 
 
Capitalization and liabilities:           
Long-term debt (including current maturities) (Note 9(b))
3,789.7
 4,418.2
 1,768.7
 2,053.0
 1,573.9
 1,908.9
Cumulative preferred stock (Note 8)
200.0
 200.2
 200.0
 200.2
 
 
Derivative liabilities (Note 15)
37.6
 37.6
 19.5
 19.5
 18.1
 18.1
2013           
Assets:           
Derivative assets (Note 15)
26.7
 26.7
 21.1
 21.1
 5.6
 5.6
Deferred proceeds (sales of receivables) (Note 5(b))
203.5
 203.5
 203.5
 203.5
 
 
Capitalization and liabilities:           
Long-term debt (including current maturities) (Note 9(b))
3,336.3
 3,712.3
 1,558.4
 1,726.4
 1,332.1
 1,532.9
Cumulative preferred stock (Note 8)
200.0
 167.0
 200.0
 167.0
 
 
Derivative liabilities (Note 15)
20.8
 20.8
 5.2
 5.2
 15.6
 15.6

Valuation Hierarchy - Fair value measurement accounting establishes athree levels of fair value hierarchy that prioritizesprioritize the inputs to valuation techniques used to measure fair value. The three levels of the fair value hierarchy and examples of each are as follows:

Level 1 - Pricingpricing inputs are quoted prices available in active markets for identical assets or liabilities as of the reporting date. At each reporting date, Level 1 items included IPL’s 5.1% cumulative preferred stock.


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Level 2 - Pricingpricing inputs are quoted prices for similar assets or liabilities in active markets or quoted prices for identical or similar assets or liabilities in markets that are not active as of the reporting date. At each reporting date, Level 2 items included certain non-exchange traded commodity contracts and substantially all of the long-term debt instruments.

Level 3 - Pricingpricing inputs are unobservable inputs for assets or liabilities for which little or no market data exist and require significant management judgment or estimation. At each reporting date, Level 3 items included FTRs, certain non-exchange traded commodity contracts and IPL’s deferred proceeds.

The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable data (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. The lowest level input that is significant to a fair value measurement in its entirety determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability.


Valuation Techniques -
Derivative assets and derivative liabilities - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices, and transmission congestion costs and riskrail transportation costs. Risk policies are maintained that govern the use of such derivative instruments. Derivative instruments were not designated as hedging instruments and included the following:
Risk management purposeType of instrument
Mitigate pricing volatility for: 
Electricity purchased to supply customersElectric swap and physical forward contracts (IPL and WPL)
Fuel used to supply natural gas-fired EGUsNatural gas swap and physical forward contracts (IPL and WPL)
 Natural gas options and physical forward contracts (WPL)
Natural gas supplied to retail customersNatural gas options and physical forward contracts (IPL and WPL)
 Natural gas swap contracts (IPL)
Fuel used at coal-fired EGUsCoal physical forward contracts (IPL and WPL)
Optimize the value of natural gas pipeline capacityNatural gas physical forward contracts (IPL and WPL)
 Natural gas swap contracts (IPL)
Manage transmission congestion costsFTRs (IPL and WPL)
Manage rail transportation costsDiesel fuel swap contracts (WPL)

Swap, option and physical forward commodity contracts were non-exchange-based derivative instruments and were valued using indicative price quotations from a pricing vendor that provides daily exchange forward price settlements, from broker or dealer quotations, from market publications or from on-line exchanges. The indicative price quotations reflected the average of the bid-ask mid-point prices and were obtained from sources believed to provide the most liquid market for the commodity. A portion of these indicative price quotations were corroborated using quoted prices for similar assets or liabilities in active markets and categorized derivative instruments based on such indicative price quotations as Level 2. Commodity contracts that were valued using indicative price quotations based on significant assumptions such as seasonal or monthly shaping and indicative price quotations that could not be readily corroborated were categorized as Level 3. Swap, option and physical forward commodity contracts were predominately at liquid trading points. FTRs were valued using monthly or annual auction shadow prices from relevant auctions and were categorized as Level 3. Refer to Note 15 for additional details of derivative assets and derivative liabilities.

The fair value measurements of Level 3 derivative instruments include observable and unobservable inputs. The observable inputs are obtained from third-party pricing sources, counterparties and brokers and include bids, offers, historical transactions (including historical price differences between locations with both observable and unobservable prices) and executed trades. The significant unobservable inputs used in the fair value measurement of commodity contracts are forecasted electricity, natural gas and coal prices, and the expected volatility of such prices. Significant changes in any of those inputs would result in a significantly lower or higher fair value measurement.

Deferred proceeds (sales of receivables) - The fair value of IPL’s deferred proceeds related to its sales of accounts receivable program was calculated each reporting date using the cost approach valuation technique. The fair value represents the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceedsamounts received from the receivables sold due to the short-term nature of the collection period. These inputs were considered unobservable and deferred proceeds were categorized as Level 3. Deferred proceeds represent IPL’s maximum exposure to loss related to the receivables sold. Refer to Note 5(b) for additional information regarding deferred proceeds.

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Long-term debt (including current maturities) - The fair value of long-term debt instruments was based on quoted market prices for similar liabilities at each reporting date or on a discounted cash flow methodology, which utilizes assumptions of current market pricing curves at each reporting date.date, and was substantially classified as Level 2. Refer to Note 9(b) for additional information regarding long-term debt.

Cumulative preferred stock - The fair value of IPL’s 5.1% cumulative preferred stock was based on its closing market price quoted by the New York Stock Exchange at each reporting date.date, and was classified as Level 1. Refer to Note 8 for additional information regarding cumulative preferred stock.

Items subject to
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value measurement disclosure requirementsbecause of the short maturity of such financial instruments. Carrying amounts and the related estimated fair values of other financial instruments at December 31 were as follows (in millions):
Alliant Energy2014 20132016 2015
Fair Level Level Level Fair Level Level Level  Fair Value   Fair Value
Value 1 2 3 Value 1 2 3Carrying Level Level Level   Carrying Level Level Level  
Amount 1 2 3 Total Amount 1 2 3 Total
Assets:                                  
Derivatives - commodity contracts
$38.6
 
$—
 
$2.6
 
$36.0
 
$26.7
 
$—
 
$4.7
 
$22.0
Derivatives
$41.4
 
$—
 
$4.6
 
$36.8
 
$41.4
 
$18.4
 
$—
 
$2.5
 
$15.9
 
$18.4
Deferred proceeds177.2
 
 
 177.2
 203.5
 
 
 203.5
211.1
 
 
 211.1
 211.1
 172.0
 
 
 172.0
 172.0
Capitalization and liabilities:               
Liabilities and equity:                   
Derivatives28.6
 
 0.5
 28.1
 28.6
 64.6
 
 16.0
 48.6
 64.6
Long-term debt (including current maturities)4,418.2
 
 4,414.9
 3.3
 3,712.3
 
 3,711.8
 0.5
4,320.2
 
 4,795.7
 3.3
 4,799.0
 3,835.6
 
 4,332.4
 3.7
 4,336.1
Cumulative preferred stock200.2
 200.2
 
 
 167.0
 167.0
 
 
Derivatives - commodity contracts37.6
 
 19.5
 18.1
 20.8
 
 3.2
 17.6
IPL’s cumulative preferred stock200.0
 194.8
 
 
 194.8
 200.0
 206.6
 
 
 206.6
IPL2014 20132016 2015
Fair Level Level Level Fair Level Level Level  Fair Value   Fair Value
Value 1 2 3 Value 1 2 3Carrying Level Level Level   Carrying Level Level Level  
Amount 1 2 3 Total Amount 1 2 3 Total
Assets:                                  
Derivatives - commodity contracts
$28.0
 
$—
 
$2.4
 
$25.6
 
$21.1
 
$—
 
$3.0
 
$18.1
Derivatives
$20.8
 
$—
 
$2.8
 
$18.0
 
$20.8
 
$15.5
 
$—
 
$2.0
 
$13.5
 
$15.5
Deferred proceeds177.2
 
 
 177.2
 203.5
 
 
 203.5
211.1
 
 
 211.1
 211.1
 172.0
 
 
 172.0
 172.0
Capitalization and liabilities:               
Liabilities and equity:                   
Derivatives8.3
 
 0.4
 7.9
 8.3
 23.4
 
 8.0
 15.4
 23.4
Long-term debt (including current maturities)2,053.0
 
 2,053.0
 
 1,726.4
 
 1,726.4
 
2,153.5
 
 2,352.3
 
 2,352.3
 1,856.9
 
 2,092.7
 
 2,092.7
Cumulative preferred stock200.2
 200.2
 
 
 167.0
 167.0
 
 
200.0
 194.8
 
 
 194.8
 200.0
 206.6
 
 
 206.6
Derivatives - commodity contracts19.5
 
 13.3
 6.2
 5.2
 
 1.7
 3.5
WPL2014 20132016 2015
Fair Level Level Level Fair Level Level Level  Fair Value   Fair Value
Value 1 2 3 Value 1 2 3Carrying Level Level Level   Carrying Level Level Level  
Amount 1 2 3 Total Amount 1 2 3 Total
Assets:                                  
Derivatives - commodity contracts
$10.6
 
$—
 
$0.2
 
$10.4
 
$5.6
 
$—
 
$1.7
 
$3.9
Capitalization and liabilities:               
Derivatives
$20.6
 
$—
 
$1.8
 
$18.8
 
$20.6
 
$2.9
 
$—
 
$0.5
 
$2.4
 
$2.9
Liabilities and equity:                   
Derivatives20.3
 
 0.1
 20.2
 20.3
 41.2
 
 8.0
 33.2
 41.2
Long-term debt (including current maturities)1,908.9
 
 1,908.9
 
 1,532.9
 
 1,532.9
 
1,535.2
 
 1,807.4
 
 1,807.4
 1,533.9
 
 1,793.0
 
 1,793.0
Derivatives - commodity contracts18.1
 
 6.2
 11.9
 15.6
 
 1.5
 14.1

Unrealized gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities.


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Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):
Alliant EnergyCommodity Contract Derivative  Commodity Contract Derivative  
Assets and (Liabilities), net Deferred ProceedsAssets and (Liabilities), net Deferred Proceeds
2014 2013 2014 20132016 2015 2016 2015
Beginning balance, January 1
$4.4
 
$11.9
 
$203.5
 
$66.8

($32.7) 
$17.9
 
$172.0
 
$177.2
Total net gains (losses) (realized/unrealized) included in changes in net assets11.1
 (12.7) 
 
Total net gains (losses) included in changes in net assets (realized/unrealized)30.7
 (63.5) 
 
Transfers into Level 3 (a)
 0.1
 
 
0.9
 
 
 
Transfers out of Level 3 (b)
 2.0
 
 
1.2
 0.3
 
 
Purchases76.7
 50.9
 
 
22.0
 36.9
 
 
Sales(2.2) 
 
 
(1.0) (1.9) 
 
Settlements (c)(a)(72.1) (47.8) (26.3) 136.7
(12.4) (22.4) 39.1
 (5.2)
Ending balance, December 31
$17.9
 
$4.4
 
$177.2
 
$203.5

$8.7
 
($32.7) 
$211.1
 
$172.0
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at December 31
($0.4) 
($12.7) 
$—
 
$—
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31
$32.7
 
($56.0) 
$—
 
$—
IPLCommodity Contract Derivative  Commodity Contract Derivative  
Assets and (Liabilities), net Deferred ProceedsAssets and (Liabilities), net Deferred Proceeds
2014 2013 2014 20132016 2015 2016 2015
Beginning balance, January 1
$14.6
 
$12.5
 
$203.5
 
$66.8

($1.9) 
$19.4
 
$172.0
 
$177.2
Total net losses (realized/unrealized) included in changes in net assets(5.9) (4.6) 
 
Transfers out of Level 3 (b)
 1.0
 
 
Total net gains (losses) included in changes in net assets (realized/unrealized)7.3
 (29.6) 
 
Transfers into Level 30.5
 
 
 
Transfers out of Level 30.2
 
 
 
Purchases68.8
 46.1
 
 
20.6
 33.1
 
 
Sales(2.0) 
 
 
(1.0) (1.8) 
 
Settlements (c)(56.1) (40.4) (26.3) 136.7
Settlements (a)(15.6) (23.0) 39.1
 (5.2)
Ending balance, December 31
$19.4
 
$14.6
 
$177.2
 
$203.5

$10.1
 
($1.9) 
$211.1
 
$172.0
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at December 31
($9.3) 
($4.6) 
$—
 
$—
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31
$8.5
 
($23.1) 
$—
 
$—
WPLCommodity Contract DerivativeCommodity Contract Derivative
Assets and (Liabilities), netAssets and (Liabilities), net
2014 20132016 2015
Beginning balance, January 1
($10.2) 
($0.6)
($30.8) 
($1.5)
Total net gains (losses) (realized/unrealized) included in changes in net assets17.0
 (8.1)
Total net gains (losses) included in changes in net assets (realized/unrealized)23.4
 (33.9)
Transfers into Level 3 (a)
 0.1
0.4
 
Transfers out of Level 3 (b)
 1.0
1.0
 0.3
Purchases7.9
 4.8
1.4
 3.8
Sales(0.2) 

 (0.1)
Settlements(16.0) (7.4)3.2
 0.6
Ending balance, December 31
($1.5) 
($10.2)
($1.4) 
($30.8)
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31
$8.9
 
($8.1)
$24.2
 
($32.9)

(a)Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period.
(b)Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period.
(c)Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceedsamounts received from the receivables sold.


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Commodity Contracts - The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) at December 31 as follows (in millions):
 Alliant Energy IPL WPL
 Excluding FTRs FTRs Excluding FTRs FTRs Excluding FTRs FTRs
2014
($7.0) 
$24.9
 
($3.2) 
$22.6
 
($3.8) 
$2.3
2013(13.9) 18.3
 (2.1) 16.7
 (11.8) 1.6
 Alliant Energy IPL WPL
 Excluding FTRs FTRs Excluding FTRs FTRs Excluding FTRs FTRs
2016
($2.3) 
$11.0
 
$0.1
 
$10.0
 
($2.4) 
$1.0
2015(43.1) 10.4
 (12.3) 10.4
 (30.8) 

(15)
NOTE 15. DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 14 for detailed discussion of derivative instruments.

Notional Amounts - As of December 31, 2014,2016, gross notional amounts by and settlement/delivery yearyears related to outstanding swap contracts, option contracts, physical forward contracts, FTRs, coal contracts and coaldiesel fuel contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 2015 2016 2017 2018 Total
Alliant Energy         
Electricity (MWhs)4,067
 1,553
 1,314
 1,314
 8,248
FTRs (MWhs)9,505
 
 
 
 9,505
Natural gas (Dths)56,250
 20,225
 1,829
 
 78,304
Coal (tons)1,490
 1,899
 1,073
 1,113
 5,575
IPL         
Electricity (MWhs)1,765
 
 
 
 1,765
FTRs (MWhs)5,503
 
 
 
 5,503
Natural gas (Dths)39,727
 10,178
 1,014
 
 50,919
Coal (tons)75
 830
 274
 387
 1,566
WPL         
Electricity (MWhs)2,302
 1,553
 1,314
 1,314
 6,483
FTRs (MWhs)4,002
 
 
 
 4,002
Natural gas (Dths)16,523
 10,047
 815
 
 27,385
Coal (tons)1,415
 1,069
 799
 726
 4,009
 Electricity FTRs Natural Gas Coal Diesel Fuel
 MWhs Years MWhs Years Dths Years Tons Years Gallons Years
Alliant Energy2,628
 2017-2018 8,970
 2017 139,865
 2017-2023 4,239
 2017-2019 6,552
 2017-2018
IPL
  5,465
 2017 56,265
 2017-2021 1,955
 2017-2019 
 
WPL2,628
 2017-2018 3,505
 2017 83,600
 2017-2023 2,284
 2017-2018 6,552
 2017-2018

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. At December 31, the fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other liabilities” on the balance sheets as follows (in millions):
Alliant Energy IPL WPLAlliant Energy IPL WPL
Commodity contracts2014 2013 2014 2013 2014 20132016 2015 2016 2015 2016 2015
Current derivative assets
$30.5
 
$25.6
 
$27.4
 
$20.2
 
$3.1
 
$5.4

$29.4
 
$15.1
 
$19.1
 
$13.8
 
$10.3
 
$1.3
Non-current derivative assets8.1
 1.1
 0.6
 0.9
 7.5
 0.2
12.0
 3.3
 1.7
 1.7
 10.3
 1.6
Current derivative liabilities28.1
 6.7
 16.4
 3.0
 11.7
 3.7
13.3
 47.3
 2.7
 18.5
 10.6
 28.8
Non-current derivative liabilities9.5
 14.1
 3.1
 2.2
 6.4
 11.9
15.3
 17.3
 5.6
 4.9
 9.7
 12.4

Changes in unrealizedUnrealized gains (losses)and losses from commodity derivative instruments wereare generally recorded with offsets to regulatory assets or regulatory liabilities, based on the balance sheets as follows (in millions):
 Alliant Energy IPL WPL
 2014 2013 2012 2014 2013 2012 2014 2013 2012
Regulatory assets
($13.8) 
($14.7) 
($37.9) 
($5.8) 
($6.6) 
($16.8) 
($8.0) 
($8.1) 
($21.1)
Regulatory liabilities37.4
 22.2
 20.3
 10.2
 11.8
 13.5
 27.2
 10.4
 6.8


153



Net unrealized gains (losses) from commodity contracts during 2014, 2013 and 2012 were primarily due to changes in electricityfuel and natural gas prices during such periods.cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. Refer to Note 2 for further discussion.

Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. At December 31, 2016 and 2015, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position as well aswas not materially different than amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions):triggered.
 2014 2013
 Alliant Energy IPL WPL Alliant Energy IPL WPL
Aggregate fair value
$37.6
 
$19.5
 
$18.1
 
$20.8
 
$5.2
 
$15.6
Credit support to be posted if triggered37.4
 19.5
 17.9
 20.8
 5.2
 15.6

Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, amounts would not be materially different from gross amounts of derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets at December 31, as follows (in millions):
 Alliant Energy IPL WPL
 Gross   Gross   Gross  
 (as reported) Net (as reported) Net (as reported) Net
2014           
Derivative assets
$38.6
 
$33.0
 
$28.0
 
$24.7
 
$10.6
 
$8.3
Derivative liabilities37.6
 32.0
 19.5
 16.2
 18.1
 15.8
2013           
Derivative assets26.7
 23.5
 21.1
 19.5
 5.6
 4.0
Derivative liabilities20.8
 17.6
 5.2
 3.6
 15.6
 14.0

2016 and 2015. Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement.

(16)NOTE 16. COMMITMENTS AND CONTINGENCIES
(a)NOTE 16(a) Capital Purchase Obligations - Various contractual obligations contain minimum future commitments related to capital expenditures for certain construction projects. IPL’s projects include the construction of Marshalltown and the installation of a scrubberan SCR system at LansingOttumwa Unit 41 to reduce SO2 emissions.NOx emissions at the EGU. WPL’s projects include the installation of a scrubber and baghouse at Edgewater Unit 5 to reduce SO2 and mercury emissions, andRiverside expansion, generation maintenance and performance improvements at Columbia Units 1 and 2.2, and the installation of an SCR system at Columbia Unit 2 to reduce NOx emissions at the EGU. At December 31, 20142016, Alliant Energy’s, IPL’s and WPL’s minimum future commitments related to certain contractual obligations for these projects were $25$58 million, $6$3 million and $19$55 million, respectively.


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(b)NOTE 16(b) Operating Expense Purchase Obligations - Various commodity supply, transportation and storage contracts help meet obligations to provide electricity and natural gas to utility customers. Other operating expense purchase obligations with various vendors provide other goods and services. At December 31, 20142016, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
Alliant Energy2015 2016 2017 2018 2019 Thereafter Total
Purchased power (a):             
DAEC (IPL) (b)
$119
 
$125
 
$138
 
$131
 
$143
 
$882
 
$1,538
Other74
 46
 44
 44
 
 
 208
 193
 171
 182
 175
 143
 882
 1,746
Natural gas175
 69
 23
 5
 2
 4
 278
Coal (c)124
 78
 47
 34
 8
 
 291
SO2 emission allowances (d)12
 14
 8
 
 
 
 34
Other (e)10
 1
 
 
 
 
 11
 
$514
 
$333
 
$260
 
$214
 
$153
 
$886
 
$2,360
Alliant Energy2017 2018 2019 2020 2021 Thereafter Total
Purchased power (a)
$185
 
$189
 
$159
 
$137
 
$149
 
$599
 
$1,418
Natural gas223
 142
 115
 98
 69
 124
 771
Coal (b)105
 54
 18
 
 
 
 177
Other (c)16
 4
 5
 2
 2
 5
 34
 
$529
 
$389
 
$297
 
$237
 
$220
 
$728
 
$2,400
IPL2015 2016 2017 2018 2019 Thereafter Total
Purchased power (a):             
DAEC (b)
$119
 
$125
 
$138
 
$131
 
$143
 
$882
 
$1,538
Other
 1
 
 
 
 
 1
 119
 126
 138
 131
 143
 882
 1,539
Natural gas108
 32
 5
 2
 2
 4
 153
Coal (c)61
 35
 20
 11
 
 
 127
SO2 emission allowances (d)12
 14
 8
 
 
 
 34
Other (e)6
 
 
 
 
 
 6
 $306 
$207
 
$171
 
$144
 
$145
 
$886
 
$1,859
IPL2017 2018 2019 2020 2021 Thereafter Total
Purchased power (a)
$138
 
$131
 
$144
 
$137
 
$149
 
$599
 
$1,298
Natural gas120
 74
 55
 39
 23
 71
 382
Coal (b)49
 19
 9
 
 
 
 77
Other (c)15
 1
 1
 
 
 
 17
 
$322
 
$225
 
$209
 
$176
 
$172
 
$670
 
$1,774
WPL2015 2016 2017 2018 2019 Thereafter Total2017 2018 2019 2020 2021 Thereafter Total
Purchased power (a)
$74
 
$45
 
$44
 
$44
 
$—
 
$—
 
$207

$47
 
$58
 
$15
 
$—
 
$—
 
$—
 
$120
Natural gas67
 37
 18
 3
 
 
 125
103
 68
 60
 59
 46
 53
 389
Coal (c)(b)63
 43
 27
 23
 8
 
 164
56
 35
 9
 
 
 
 100
Other (e)(c)2
 1
 
 
 
 
 3

 1
 1
 
 
 
 2

$206
 
$126
 
$89
 
$70
 
$8
 
$—
 
$499

$206
 
$162
 
$85
 
$59
 
$46
 
$53
 
$611

(a)
Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. Refer to Note 18 for additional information on purchased power transactions.
(b)
Includes commitments incurred under a PPA, which grants IPL rights to purchase up to 431 MWs of capacity and the resulting energy from DAEC for a term through December 31, 2025. If energy delivered is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s fuel adjustment clause.
(c)Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of December 31, 20142016 regarding expected future usage, which is subject to change.
(d)(c)
Refer to Note 2 for discussion of $34 million of charges recognized by Alliant Energy and IPL in 2011 for forward contracts to purchase SO2 emission allowances.
(e)
Includes individual commitments incurred during the normal course of business that exceeded $1$1 million at December 31, 2014.
2016.

Certain contracts are considered leases and are therefore not included here, but are included in Note 10.

(c)NOTE 16(c) Legal Proceedings -
Flood Damage Claims - In June 2013, several plaintiffs purporting to represent a class of residential and commercial property owners filed a complaint against CRANDIC, Alliant Energy and various other defendants in the Iowa District Court for Linn County. Plaintiffs assert claims of negligence and strict liability based on their allegations that CRANDIC (along with other defendants) caused or exacerbated flooding of the Cedar River in June 2008. In July 2013,February 2016, the case was removed from state court to federal court based on federal jurisdiction. In September 2013, the U.S.Iowa District Court for the Northern DistrictLinn County ruled in favor of Iowa dismissed the Plaintiffs’ claims and transferred the case for resolution to the Surface Transportation Board, the administrative agency that oversees the Interstate Commerce Commission Termination Act. In October 2013, the

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Plaintiffs appealed the federal court’s dismissal of the case to the Eighth Circuit Court of Appeals. Alliant Energy and CRANDIC believeand dismissed all claims against them, resulting in no loss. In August 2016, the case is without merit and will continue to vigorously contestIowa District Court for Linn County dismissed all claims against the case. Asremaining defendants. In September 2016, plaintiffs filed a result,notice of appeal with the Supreme Court of Iowa. Alliant Energy does not currently believe any material losses from these claimsfor this complaint are both probable and reasonably estimated, and therefore has not recognized any material loss contingency amounts for this complaint as of December 31, 2014. Due to the early stages of the claim and the lack of specific damages identified, Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss.2016.

Other - Alliant Energy, IPL and WPL are involved in other legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business. Although unable to predict the outcome of these matters, Alliant Energy, IPL and WPL believe that appropriate reserves have been established and final disposition of these actions will not have a material effect on their financial condition or results of operations.

(d)NOTE 16(d) Guarantees and Indemnifications -
RMT - In 2013, Alliant Energy sold RMT. RMT provided renewable energy services, including construction and high voltage connection services for wind and solar projects. As part of the sale, Alliant Energy indemnified the buyer for any claims, including claims of warranty under the project obligations that were commenced or are based on actions that occurred prior to the sale, except for liabilities already accounted for through adjustments to the purchase price. TheIn 2016, the indemnification obligations either cease to exist when the statute of limitation for such claims is met or, in the case of RMT’s projects, when the warranty period under the agreements expires. Theand contractual warranty periods expired; however, limited warranties may be extended in certain cases for RMT’s projects generally range from 12 to 60 months with the latest expiring in 2016.warranty work performed.

Alliant Energy also continues to guarantee RMT’s performance obligations related to certain of RMT’s projects that were commenced prior to Alliant Energy’s sale of RMT. As of December 31, 20142016, Alliant Energy had $25175 million of performance guarantees outstanding, with $128 million, $48 million and $75 millionwhich are currently expected to expire in 2015, 2016 and 2017, respectively.2017. The expiration of these performance guarantees may be extended depending on when all valid warranty claims are resolved for the respective projects.

Although Alliant Energy has received warranty claims related to certain of these projects, it does not currently believe that material losses are both probable and reasonably estimated, and therefore, has not recognized any material liabilities related to these matters as of December 31, 2014. Due to2016. Alliant Energy does not currently believe that the early stagesrange of thefuture potential loss from any warranty claims Alliant Energy is currently unable to provide an estimate of potential loss or range of potential loss.will be material. Refer to Note 19 for further discussion of RMT, including amounts Alliant Energy recorded to “Operating expenses” in 2016, 2015 and 2014 related to certain warranty claims.

Whiting Petroleum - In 2004, Alliant Energy sold its remaining interest in Whiting Petroleum. Whiting Petroleum is an independent oil and gas company. Alliant Energy Resources, LLC, as the successor to a predecessor entity that owned Whiting Petroleum, and a wholly-owned subsidiary of AEF, continues to guarantee the partnership obligations relatedof an affiliate of Whiting Petroleum under general partnership agreements in the oil and gas industry, including with respect to the future abandonment of certain platforms off the coast of California and related onshore plant and equipment that were owned by Whiting Petroleum prior to Alliant Energy’s sale of Whiting Petroleum.the partnerships. The guarantee doesguarantees do not include a maximum limit. As of December 31, 2014,2016, the present value of the abandonment obligations is estimated at $35 million.$31 million. Alliant Energy believesis not aware of any material liabilities related to these guarantees of which it is probable that no paymentsAlliant Energy Resources, LLC will be made under this guarantee. Alliant Energyobligated to pay and therefore has not recognized any material liabilities related to this guarantee as of December 31, 2014.2016.

IPL’s Minnesota Electric Distribution Assets - IPL provided indemnifications associated with the July 2015 sale of its Minnesota electric distribution assets for losses resulting from potential breach of IPL’s representations, warranties and obligations under the sale agreement. Alliant Energy and IPL believe the likelihood of having to make any material cash payments under these indemnifications is remote. IPL has not recorded any material liabilities related to these indemnifications as of December 31, 2016. The general terms of the indemnifications provided by IPL included a maximum limit of $17 million and expire in October 2020. Refer to Note 3 for further discussion of the sale of IPL’s Minnesota electric distribution assets.

(e)NOTE 16(e) Environmental Matters - Alliant Energy, IPL and WPL are subject to environmental regulations as a result of their current and past operations. These regulations are designed to protect public health and the environment and have resulted in compliance, remediation, containment and monitoring obligations, which are recorded as environmental liabilities. At December 31, current environmental liabilities were included in “Other current liabilities” and non-current environmental liabilities. Substantially all of the environmental liabilities were included in “Other liabilities”recorded on the balance sheets as follows (in millions):relate to MGP sites.
 Alliant Energy IPL WPL
 2014 2013 2014 2013 2014 2013
Current environmental liabilities
$2.0
 
$3.6
 
$1.7
 
$2.8
 
$0.3
 
$0.8
Non-current environmental liabilities13.5
 15.4
 11.9
 13.6
 1.6
 1.7
 
$15.5
 
$19.0
 
$13.6
 
$16.4
 
$1.9
 
$2.5

MGP Sites - IPL and WPL have current or previous ownership interests in various sites that are previously associated with the production of gas for which IPL and WPL have, or may have in the future, liability for investigation, remediation and monitoring costs. IPL and WPL are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around these former MGP sites in order to protect public health and the environment. IPL and WPL are currently monitoring

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and/or remediating 25 and 5 sites, respectively. Included in IPL’s sites is a Minnesota site for which responsibility of monitoring and/or remediating the site is expected to be transferred to the buyer as part of the anticipated sale of IPL’s Minnesota natural gas distribution assets.

Environmental liabilities related to these MGP sites are recorded based upon periodic studies. Such amounts are based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed, and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. There are inherent uncertainties associated with the estimated remaining costs for MGP projects primarily due to unknown site conditions and potential changes in regulatory agency requirements. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds and as additional facts become known. The amounts recognized as liabilities are reduced for expenditures incurred and are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted. At December 31, 2014,2016, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):. At December 31, 2016, such amounts for WPL were not material.
Alliant Energy IPL WPLAlliant Energy IPL
Range of estimated future costs
$12
-$31 
$11
-$29 
$1
-$2
$14
-$27 
$12
-$24
Current and non-current environmental liabilities16 14 216 13


Refer to Note 2 for discussion of regulatory assets recorded by IPL and WPL, which reflect the probable future rate recovery of MGP expenditures. Considering the current rate treatment, and assuming no material change therein, Alliant Energy, IPL and WPL believe that the clean-up costs incurred for these MGP sites will not have a material effect on their financial condition or results of operations. Settlement has been reached with all of IPL’s and WPL’s insurance carriers regarding reimbursement for their MGP-related costs and such amounts have been accounted for as directed by the applicable regulatory jurisdiction.

WPL Consent Decree - In 2009,2013, the U.S. District Court for the Western District of Wisconsin approved a Consent Decree that WPL, along with the other owners of Edgewater and Columbia, entered into with the EPA sent a notice of violation to WPL as an owner and the operatorSierra Club, thereby resolving claims against WPL. Such claims included allegations that the owners of Edgewater, Nelson Dewey and Columbia alleging that the owners of such EGUs failed to comply with appropriate pre-construction review and permitting requirements and as a result violated the PSDPrevention of Significant Deterioration program requirements, Title V Operating Permit requirements of the CAA and the Wisconsin SIP. In 2010, the Sierra Club filed complaints against WPL, as owner and operator of Nelson Dewey and Columbia, and separately as owner and operator of Edgewater, based on allegations that modifications were made at the facilities without complying with the PSD program requirements, Title V Operating Permit requirements of the CAA and state regulatory counterparts contained within the Wisconsin SIPState Implementation Plan designed to implement the CAA.

In April 2013, WPL along with the other owners of Edgewater and Columbia, entered into a Consent Decree with the EPA and the Sierra Club to resolve the claims relating to Edgewater, Columbia and Nelson Dewey, while admitting no liability. In June 2013,has completed various requirements under the Consent Decree was approved by the Court, thereby resolving all claims against WPL. Under the Consent Decree, WPL is required to install the following emission controls systems:

SCR system at Edgewater Unit 5 by May 1, 2013 (placed in service in 2012);
Scrubbers and baghouses at Columbia Units 1 and 2 by December 31, 2014 (placed in service in 2014);
Scrubber and baghouse at Edgewater Unit 5 by December 31, 2016; and
Decree. WPL’s remaining requirements include installing an SCR system at Columbia Unit 2 by December 31, 2018.

WPL is also required toand fuel switchswitching or retire Nelson Dewey Units 1 and 2 and Edgewater Unit 3 by December 31, 2015, andretiring Edgewater Unit 4 by December 31, 2018. In addition, theThe Consent Decree also establishes emission rate limits for SO2, NOx and particulate matter emission rate limits for Columbia Units 1 and 2, Nelson Dewey Units 1 and 2, and Edgewater Units 4 and 5. TheIn addition, the Consent Decree also includes annual plant-wide SO2 and NOx emission caps for SO2Columbia and NOx for Columbia, Edgewater and Nelson Dewey. In addition,Edgewater. WPL will completeis in the process of completing approximately $7 million in environmental mitigation projects.

Final recovery of the costs expected to be incurred related to the Consent Decree will be decided by the PSCW in future rate cases or other proceedings. Alliant Energy and WPL currently expect to recover any material costs incurred by WPL related to compliance with the terms of the Consent Decree from WPL’s electric customers, exceptcustomers.

IPL Consent Decree - In 2015, the U.S. District Court for the Northern District of Iowa approved a Consent Decree that IPL entered into with the EPA, the Sierra Club, the State of Iowa and Linn County in Iowa, thereby resolving potential CAA issues associated with emissions from IPL’s coal-fired generating facilities in Iowa. IPL has completed various requirements under the Consent Decree. IPL’s remaining requirements include installing an SCR system or equivalent NOx reduction system at the Ottumwa Generating Station by December 31, 2019; fuel switching or retiring Prairie Creek Unit 4 by June 1, 2018, the Burlington Generating Station by December 31, 2021 and Prairie Creek Units 1 and 3 by December 31, 2025; and either installing combined cycle technology at, or retiring, the Dubuque and Sutherland Generating Stations by June 1, 2019.

The Consent Decree also establishes SO2, NOx and particulate matter emission rate limits with varying averaging times for the Burlington, Lansing, M.L. Kapp, Ottumwa and Prairie Creek Generating Stations. In addition, the Consent Decree includes calendar-year SO2 and NOx emission caps for the Prairie Creek Generating Station, and calendar-year SO2 and NOx emission caps in aggregate for the Burlington, Dubuque, Lansing, M.L. Kapp, Ottumwa, Prairie Creek and Sutherland Generating Stations. IPL is in the process of completing approximately $6 million in environmental mitigation projects. Alliant Energy and IPL currently expect to recover material costs incurred by IPL related to certain of the environmental control systems and environmental mitigation projects.projects from IPL’s electric customers.


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Other Environmental Contingencies - In addition to the environmental liabilities discussed above, various environmental rules are monitored that may have a significant impact on future operations. Several of these environmental rules are subject to legal challenges, reconsideration and/or other uncertainties. Given uncertainties regarding the outcome, timing and compliance plans for these environmental matters, the complete financial impact of each of these rules is not able to be determined; however future capital investments and/or modifications to EGUs to comply with certain of these rules could be significant. Specific current, proposed or potential environmental matters are included below, along with a brief descriptioninclude, among others: CSAPR, Effluent Limitation Guidelines, CCR Rule, and various legislation and EPA regulations to monitor and regulate the emission of these environmental rules.GHG, including carbon emissions from new (CAA Section 111(b)) and existing (CAA Section 111(d)) fossil-fueled EGUs.

Air Quality -
CSAPR is an emissions trading program that requires SO2 and NOx emissions reductions at certain IPL and WPL fossil-fueled EGUs through installation of emission controls and/or purchases of allowances. Compliance with emissions limits began in 2015, with additional emissions limits reductions beginning in 2017.

CAVR requires states to develop and implement plans to address visibility impairment in designated national parks and wilderness areas. These implementation plans require BART emission controls at certain IPL and WPL fossil-fueled EGUs and other additional measures needed for reducing state contributions to regional haze.

MATS Rule requires compliance with emission limits for mercury and other HAPs and work practice standards for existing coal-fired EGUs. Compliance is required by April 2015; however, an entity can request an additional year for compliance for certain EGUs. The Wisconsin DNR approved an extension to the MATS compliance deadline to April 2016 for WPL’s Edgewater Unit 3 and Nelson Dewey Units 1 and 2.

Industrial Boiler and Process Heater MACT Rule requires compliance with HAPs emission limitations and work practice standards at certain IPL and WPL EGUs and fossil-fueled auxiliary boilers and process heaters located at EGUs by January 2016.

Ozone NAAQS Rule may require a reduction of NOx emissions in certain non-attainment areas based on classifications assigned by the EPA. In 2012, the EPA issued a final rule that classified Sheboygan County in Wisconsin as marginal ozone non-attainment, which requires this area to achieve compliance with the ozone NAAQS by December 2015. WPL operates Edgewater and Sheboygan Falls in Sheboygan County, Wisconsin.

SO2 NAAQS Rule establishes SO2 standards for certain areas of the U.S. currently exceeding the SO2 standard based on ambient monitoring data. IPL and WPL do not currently operate any EGUs in any areas that have non-attainment designations.

CAA Section 111(d) proposal would reduce CO2 emissions from existing fossil-fueled EGUs. The EPA is proposing a two-part goal structure: an “interim goal” that each state meets an average threshold over the period from 2020 through 2029, and a “final goal” based on a three-year rolling average that each state meets beginning in 2030. State plans that provide details of how these guidelines are to be met would be required by June 30, 2016. The EPA’s proposal allows for a one-year extension to submit state-only plans and a two-year extension if a state elects to join a regional multi-state program. The EPA is currently expected to issue final standards in 2015.

CAA Section 111(b) proposal would establish CO2 emissions limits for certain new fossil-fueled EGUs. Marshalltown and WPL’s proposed Riverside expansion are expected to be impacted by these proposed standards and would be constructed to achieve compliance with these standards. The EPA is currently expected to issue final standards in 2015.

Water Quality -
Section 316(b) of the Federal Clean Water Act regulates cooling water intake structures and minimizes adverse environmental impacts to fish and other aquatic life. Compliance will be incorporated during periodic facility permit renewal cycles, with final compliance anticipated by 2022.

Effluent Limitation Guidelines proposal would require changes to discharge limits for wastewater from steam generating facilities. Compliance would be required after July 1, 2017 but before July 1, 2022, depending on each facility’s wastewater permit cycle for existing steam generating facilities and immediately upon operation for new steam generating facilities constructed after the issuance of the final guidelines.

Hydroelectric Fish Passage Device - WPL is currently required to install an agency-approved fish passage device at its Prairie du Sac hydro plant by December 31, 2020.

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Land and Solid Waste -
CCR Rule establishes minimum criteria for disposing of CCR in landfills and surface impoundments (ash ponds), and allows for continued operation of ash ponds if they meet certain performance criteria. The schedule for compliance with this rule has not yet been established.

(f)NOTE 16(f) Credit Risk - IPL and WPL provide regulated electricity and natural gas services to residential, commercial, industrial and wholesale customers in the Midwest region of the U.S.Iowa, Minnesota and Illinois for IPL and Wisconsin for WPL. The geographic concentration of these customers did not contribute significantly to overall credit risk exposure. In addition, as a result of a diverse customer base, IPL and WPL did not have any significant credit risk concentration for receivables arising from the sale of electricity or natural gas services.

Alliant Energy, IPL and WPL are subject to credit risk related to the ability of counterparties to meet their contractual payment obligations or the potential non-performance of counterparties to deliver contracted commodities and other goods or services at the contracted price. IPL and WPL are typically net buyers of commodities (primarily electricity, coal and natural gas) required to provide regulated electricity and natural gas services to their customers. As a result, IPL and WPL are also subject to credit risk related to their counterparties’ failures to deliver commodities at the contracted price.

Credit policies are maintained to mitigate credit risk. These credit policies include evaluation of the financial condition of certain counterparties, use of credit risk-related contingent provisions in certain commodity agreements that require credit support from counterparties that exceed certain exposure limits,not meeting specific criteria, diversification of counterparties to reduce concentrations of credit risk and the use of standardized agreements that facilitate the netting of cash flows associated with certain counterparties.

IPL has a PPA that grants it rights to purchase capacity and the resulting energy from DAEC through December 31, 2025. This PPA exposes Alliant Energy and IPL to risk of counterparty non-performance. However, financial risk is mitigated by IPL’s fuel-related cost recovery mechanisms. Refer to Note 16(b) for further discussion of the DAEC PPA.

Based on these credit policies and counterparty diversification, andas well as utility cost recovery mechanisms, it is unlikely that counterparty non-performance would have a material effect on financial condition or results of

operations. However, there is no assurance that these items will protect against all losses from counterparty non-performance.

Refer to Notes 5(a) and 15 for details of allowances for doubtful accounts and credit risk-related contingent features, respectively.

(17)NOTE 16(g) Collective Bargaining Agreements - At December 31, 2016, employees covered by collective bargaining agreements represented 56%, 65% and 81% of total employees of Alliant Energy, IPL and WPL, respectively. In August 2017, IPL’s collective bargaining agreement with International Brotherhood of Electrical Workers Local 204 (Cedar Rapids) expires, representing 19% and 46% of total employees of Alliant Energy and IPL, respectively.

NOTE 17. SEGMENTS OF BUSINESS
Alliant Energy - Alliant Energy’s principal businesses as of December 31, 20142016 are:
Utility - includes the operations of IPL and WPL, which primarily serve retail customers in Iowa Wisconsin and Minnesota.Wisconsin. The utility business has three reportable segments: a) utility electric operations;operations, which include Alliant Energy’s investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total Utility.”
Non-regulated, Parent and Other - includes the operations of ResourcesAEF and its subsidiaries, Corporate Services, the Alliant Energy parent company, and any Alliant Energy parent company consolidating adjustments. Resources’AEF’s businesses include Transportation, Non-regulated Generation and other non-regulated investments described in Note 1(a).

Alliant Energy’s administrative support services are directly charged to the applicable segment where practicable. In all other cases, administrative support services are allocated to the applicable segment based on services agreements. Intersegment revenues were not material to Alliant Energy’s operations and there was no single customer whose revenues were 10% or more of Alliant Energy’s consolidated revenues. All of Alliant Energy’s operations and assets are located in the U.S.


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Certain financial information relating to Alliant Energy’s business segments, products andwhich represent the services and geographic informationprovided to its customers, was as follows (in millions):
Utility Non-Regulated, Alliant EnergyUtility Non-Regulated, Alliant Energy
2014Electric Gas Other Total Parent and Other Consolidated
2016Electric Gas Other Total Parent and Other Consolidated
Operating revenues
$2,713.6
 
$517.5
 
$66.1
 
$3,297.2
 
$53.1
 
$3,350.3

$2,875.5
 
$355.4
 
$48.6
 
$3,279.5
 
$40.5
 
$3,320.0
Depreciation and amortization347.0
 29.9
 1.8
 378.7
 9.4
 388.1
367.0
 34.2
 2.1
 403.3
 8.3
 411.6
Operating income442.4
 53.8
 14.0
 510.2
 33.4
 543.6
Operating income (loss)571.9
 30.7
 (4.8) 597.8
 (60.8) 537.0
Interest expense      176.3
 4.3
 180.6
      194.6
 1.6
 196.2
Equity income from unconsolidated investments, net(42.8) 
 
 (42.8) 2.4
 (40.4)
Income taxes      33.9
 10.4
 44.3
Net income attributable to Alliant Energy common shareowners      364.5
 18.6
 383.1
Equity (income) loss from unconsolidated investments, net(39.8) 
 
 (39.8) 0.2
 (39.6)
Income tax expense (benefit)      87.4
 (28.0) 59.4
Net income (loss) attributable to Alliant Energy common shareowners      406.0
 (34.5) 371.5
Total assets9,660.4
 913.5
 1,016.1
 11,590.0
 495.9
 12,085.9
11,040.5
 1,091.1
 781.0
 12,912.6
 461.2
 13,373.8
Investments in equity method subsidiaries294.3
 
 
 294.3
 2.3
 296.6
325.3
 
 
 325.3
 0.7
 326.0
Construction and acquisition expenditures774.8
 63.2
 0.9
 838.9
 63.9
 902.8
1,005.5
 137.1
 0.1
 1,142.7
 54.1
 1,196.8
Utility Non-Regulated, Alliant EnergyUtility Non-Regulated, Alliant Energy
2013Electric Gas Other Total Parent and Other Consolidated
2015Electric Gas Other Total Parent and Other Consolidated
Operating revenues
$2,689.0
 
$464.8
 
$71.3
 
$3,225.1
 
$51.7
 
$3,276.8

$2,770.5
 
$381.2
 
$57.9
 
$3,209.6
 
$44.0
 
$3,253.6
Depreciation and amortization333.0
 28.8
 1.5
 363.3
 7.6
 370.9
358.6
 31.1
 1.8
 391.5
 9.8
 401.3
Operating income444.5
 57.3
 6.3
 508.1
 25.8
 533.9
514.1
 34.6
 1.9
 550.6
 26.4
 577.0
Interest expense      166.3
 6.5
 172.8
      189.2
 (2.1) 187.1
Equity income from unconsolidated investments, net(43.7) 
 
 (43.7) 
 (43.7)
Equity (income) loss from unconsolidated investments, net(35.1) 
 
 (35.1) 1.3
 (33.8)
Income taxes      49.3
 4.6
 53.9
      60.2
 10.2
 70.4
Net income attributable to Alliant Energy common shareowners      349.5
 8.8
 358.3
      362.3
 15.9
 378.2
Total assets9,018.6
 859.3
 732.5
 10,610.4
 502.0
 11,112.4
10,211.3
 939.3
 828.9
 11,979.5
 515.7
 12,495.2
Investments in equity method subsidiaries279.1
 
 
 279.1
 2.3
 281.4
302.0
 
 
 302.0
 0.9
 302.9
Construction and acquisition expenditures677.3
 47.0
 7.3
 731.6
 66.7
 798.3
855.8
 106.4
 1.4
 963.6
 70.7
 1,034.3

Utility Non-Regulated, Alliant EnergyUtility Non-Regulated, Alliant Energy
2012Electric Gas Other Total Parent and Other Consolidated
2014Electric Gas Other Total Parent and Other Consolidated
Operating revenues
$2,589.3
 
$396.3
 
$56.7
 
$3,042.3
 
$52.2
 
$3,094.5

$2,713.6
 
$517.5
 
$66.1
 
$3,297.2
 
$53.1
 
$3,350.3
Depreciation and amortization299.3
 29.1
 1.4
 329.8
 2.6
 332.4
347.0
 29.9
 1.8
 378.7
 9.4
 388.1
Operating income426.2
 51.5
 7.4
 485.1
 34.6
 519.7
442.4
 53.8
 14.0
 510.2
 33.4
 543.6
Interest expense      158.7
 (2.0) 156.7
      176.3
 4.3
 180.6
Equity (income) loss from unconsolidated investments, net(42.1) 
 
 (42.1) 0.8
 (41.3)
Equity income (loss) from unconsolidated investments, net(42.8) 
 
 (42.8) 2.4
 (40.4)
Income taxes      74.8
 14.6
 89.4
      36.4
 7.9
 44.3
Net income attributable to Alliant Energy common shareowners      300.0
 19.8
 319.8
      362.0
 21.1
 383.1
Total assets8,438.8
 814.8
 966.0
 10,219.6
 565.9
 10,785.5
9,660.4
 913.5
 993.9
 11,567.8
 495.7
 12,063.5
Investments in equity method subsidiaries264.3
 
 
 264.3
 2.3
 266.6
294.3
 
 
 294.3
 2.3
 296.6
Construction and acquisition expenditures994.0
 31.4
 0.1
 1,025.5
 132.6
 1,158.1
774.8
 63.2
 0.9
 838.9
 63.9
 902.8

Products and Services - Alliant Energy’s consolidated operating revenues by segment, which were substantially all related to services, were as follows:
 2014 2013 2012
Utility electric operations81% 82% 84%
Utility gas operations15% 14% 13%
Utility other2% 2% 2%
Other2% 2% 1%
 100% 100% 100%

Geographic Information - At December 31, 2014, 2013 and 2012, Alliant Energy, IPL and WPL did not have any long-lived assets to be held and used in foreign countries.

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IPL - IPL is a utility primarily serving retail customers in Iowa and Minnesota and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes steam operations and the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to IPL’s operations and there was no single customer whose revenues were 10% or more of IPL’s consolidated revenues. All of IPL’s operations and assets are located in the U.S. Certain financial information relating to IPL’s business segments, which represent the services provided to its customers, was as follows (in millions):
2014Electric Gas Other Total
2016Electric Gas Other Total
Operating revenues
$1,493.3
 
$296.5
 
$58.3
 
$1,848.1

$1,569.7
 
$204.0
 
$46.7
 
$1,820.4
Depreciation and amortization178.7
 17.0
 1.8
 197.5
189.4
 19.3
 2.1
 210.8
Operating income166.8
 25.7
 16.7
 209.2
252.0
 15.5
 3.3
 270.8
Interest expense      89.9
      103.2
Income tax benefit      (51.7)      (5.9)
Earnings available for common stock      184.4
      215.6
Total assets5,398.3
 544.1
 519.4
 6,461.8
6,278.2
 653.3
 373.2
 7,304.7
Construction and acquisition expenditures490.0
 35.1
 0.9
 526.0
598.1
 91.5
 0.1
 689.7
2013Electric Gas Other Total
2015Electric Gas Other Total
Operating revenues
$1,491.8
 
$273.9
 
$53.1
 
$1,818.8

$1,503.8
 
$217.3
 
$53.4
 
$1,774.5
Depreciation and amortization173.1
 16.5
 1.5
 191.1
187.9
 17.5
 1.8
 207.2
Operating income173.1
 29.8
 9.1
 212.0
218.8
 17.7
 5.4
 241.9
Interest expense      81.3
      96.8
Income tax benefit      (37.9)      (22.7)
Earnings available for common stock      173.6
      186.0
Total assets4,905.3
 518.8
 381.9
 5,806.0
5,754.1
 548.2
 406.8
 6,709.1
Construction and acquisition expenditures365.4
 27.5
 7.3
 400.2
561.2
 56.7
 1.4
 619.3
2012Electric Gas Other Total
2014Electric Gas Other Total
Operating revenues
$1,371.1
 
$226.7
 
$52.5
 
$1,650.3

$1,493.3
 
$296.5
 
$58.3
 
$1,848.1
Depreciation and amortization171.2
 16.3
 1.4
 188.9
178.7
 17.0
 1.8
 197.5
Operating income166.2
 24.2
 9.9
 200.3
166.8
 25.7
 16.7
 209.2
Interest expense      78.5
      89.9
Income tax benefit      (19.8)      (48.9)
Earnings available for common stock      137.6
      181.6
Total assets4,500.9
 479.5
 476.6
 5,457.0
5,398.3
 544.1
 507.8
 6,450.2
Construction and acquisition expenditures291.0
 16.4
 0.1
 307.5
490.0
 35.1
 0.9
 526.0

WPL - WPL is a utility serving customers in Wisconsin and includes three reportable segments: a) electric operations; b) gas operations; and c) other, which includes the unallocated portions of the utility business. Various line items in the following tables are not allocated to the electric and gas segments for management reporting purposes, and therefore, are included only in “Total.” Intersegment revenues were not material to WPL’s operations and there was no single customer whose revenues were 10% or more of WPL’s consolidated revenues. All of WPL’s operations and assets are located in the U.S. Certain financial information relating to WPL’s business segments, which represent the services provided to its customers, was as follows (in millions):
2014Electric Gas Other Total
Operating revenues
$1,220.3
 
$221.0
 
$7.8
 
$1,449.1
Depreciation and amortization168.3
 12.9
 
 181.2
Operating income (loss)275.6
 28.1
 (2.7) 301.0
Interest expense      86.4
Equity income from unconsolidated investments(42.8) 
 
 (42.8)
Income taxes      85.6
Earnings available for common stock      180.1
Total assets4,262.1
 369.4
 496.7
 5,128.2
Investments in equity method subsidiaries294.3
 
 
 294.3
Construction and acquisition expenditures284.8
 28.1
 
 312.9

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2013Electric Gas Other Total
Operating revenues
$1,197.2
 
$190.9
 
$18.2
 
$1,406.3
Depreciation and amortization159.9
 12.3
 
 172.2
Operating income (loss)271.4
 27.5
 (2.8) 296.1
Interest expense      85.0
Equity income from unconsolidated investments(43.7) 
 
 (43.7)
Income taxes      87.2
Earnings available for common stock      175.9
Total assets4,113.3
 340.5
 350.6
 4,804.4
Investments in equity method subsidiaries279.1
 
 
 279.1
Construction and acquisition expenditures311.9
 19.5
 
 331.4
2012Electric Gas Other Total
2016Electric Gas Other Total
Operating revenues
$1,218.2
 
$169.6
 
$4.2
 
$1,392.0

$1,305.8
 
$151.4
 
$1.9
 
$1,459.1
Depreciation and amortization128.1
 12.8
 
 140.9
177.6
 14.9
 
 192.5
Operating income (loss)260.0
 27.3
 (2.5) 284.8
319.9
 15.2
 (8.1) 327.0
Interest expense      80.2
      91.4
Equity income from unconsolidated investments(42.1) 
 
 (42.1)(39.8) 
 
 (39.8)
Income taxes      94.6
      93.3
Earnings available for common stock      162.4
      190.4
Total assets3,937.9
 335.3
 489.4
 4,762.6
4,444.7
 437.8
 407.8
 5,290.3
Investments in equity method subsidiaries264.3
 
 
 264.3
7.7
 
 
 7.7
Construction and acquisition expenditures703.0
 15.0
 
 718.0
407.4
 45.6
 
 453.0
2015Electric Gas Other Total
Operating revenues
$1,266.7
 
$163.9
 
$4.5
 
$1,435.1
Depreciation and amortization170.7
 13.6
 
 184.3
Operating income (loss)295.3
 16.9
 (3.5) 308.7
Interest expense      92.4
Equity income from unconsolidated investments(35.1) 
 
 (35.1)
Income taxes      82.9
Earnings available for common stock      176.3
Total assets4,457.2
 391.1
 422.1
 5,270.4
Investments in equity method subsidiaries302.0
 
 
 302.0
Construction and acquisition expenditures294.6
 49.7
 
 344.3
2014Electric Gas Other Total
Operating revenues
$1,220.3
 
$221.0
 
$7.8
 
$1,449.1
Depreciation and amortization168.3
 12.9
 
 181.2
Operating income (loss)275.6
 28.1
 (2.7) 301.0
Interest expense      86.4
Equity income from unconsolidated investments(42.8) 
 
 (42.8)
Income taxes      85.3
Earnings available for common stock      180.4
Total assets4,262.1
 369.4
 486.1
 5,117.6
Investments in equity method subsidiaries294.3
 
 
 294.3
Construction and acquisition expenditures284.8
 28.1
 
 312.9

(18)NOTE 18. RELATED PARTIES
Service Agreements - IPL and WPL are parties to service agreements with an affiliate, Corporate Services. Pursuant to these service agreements, IPL and WPL receive various administrative and general services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services, depreciation and amortization of property, plant and equipment, and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO and PJM.MISO. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO and PJM.MISO. The amounts billed for services provided, sales credited and purchases were as follows (in millions):
IPL WPLIPL WPL
2014 2013 2012 2014 2013 20122016 2015 2014 2016 2015 2014
Corporate Services billings
$148
 
$140
 
$129
 
$116
 
$103
 
$102

$161
 
$150
 
$148
 
$133
 
$121
 
$116
Sales credited8
 7 10 6
 12 148
 10 8 7
 24 6
Purchases billed422
 365 301 125
 68 61433
 366 422 102
 66 125

As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
2014 20132016 2015
IPL
$84
 
$62

$104
 
$93
WPL58
 46
72
 54


ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. The related amounts billed between the parties were as follows (in millions):
2014 2013 20122016 2015 2014
ATC billings to WPL
$96
 
$96
 
$90

$110
 
$101
 
$96
WPL billings to ATC9
 12
 11
13
 13
 9

As of December 31, 20142016 and 20132015, WPL owed ATC net amounts of $8 million and $8 million, respectively.

Refer to Note 6(a) for discussion of WPL’s transfer of its investment in ATC to ATI on December 31, 2016.

WPL’s Sheboygan Falls Lease - Refer to Note 10(b) for discussion of WPL’s Sheboygan Falls lease.

162

Franklin County Wind Farm - Refer to TableNote 3 for discussion of Contentsa February 2017 FERC order approving the transfer of the Franklin County wind farm from AEF to IPL. Alliant Energy and IPL currently expect to complete this transfer in 2017.



(19)NOTE 19. DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE
In January 2013, Alliant Energy sold RMT to narrow its strategic focus and risk profile. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy’s income statements. A summary of the components of discontinued operations in Alliant Energy’s income statements was as follows (in millions):
2014 2013 20122016 2015 2014
Operating revenues
$—
 
$0.9
 
$289.2
Operating expenses3.7
 9.9
 297.0

$3.9
 
$4.0
 
$3.7
Interest expense and other
 
 0.7
Loss before income taxes(3.7) (9.0) (8.5)(3.9) (4.0) (3.7)
Income tax benefit(1.3) (3.1) (3.4)(1.6) (1.5) (1.3)
Loss from discontinued operations, net of tax
($2.4) 
($5.9) 
($5.1)
($2.3) 
($2.5) 
($2.4)

Refer to Note 16(d) for further discussion of RMT.warranty claims associated with RMT that have resulted in operating expenses subsequent to the sale.

In December 2014, the MPUC issued an order approving the proposed sale of IPL’s Minnesota natural gas distribution assets. As a result, these assets qualified as held for sale as of December 31, 2014. As of December 31, 2014, Alliant Energy’s and IPL’s balance sheets included assets held for sale recorded in “Other current assets” and liabilities held for sale recorded in “Other current liabilities” as follows (in millions):
Assets held for sale:
Current assets
$1.1
Property, plant and equipment, net11.0
Other assets7.0
Total assets held for sale19.1
Liabilities held for sale:
Current liabilities1.0
Other liabilities7.1
Total liabilities held for sale8.1
Net assets held for sale
$11.0

The operating results of IPL’s Minnesota natural gas distribution assets have not been separately classified and reported as discontinued operations in Alliant Energy’s and IPL’s income statements. Refer to Note 1(p) for discussion of Alliant Energy’s and IPL’s evaluation of discontinued operations related to these assets. Refer to Note 3 for further discussion of IPL’s anticipated sale of its Minnesota natural gas distribution assets.


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(20)NOTE 20. SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)
Alliant Energy - All “per share” references refer to earnings per diluted share. Summation of the individual quarters may not equal annual totals due to rounding. Refer to Note 19 for additional information on discontinued operations.
2014 20132016 2015
March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31
(in millions, except per share data)(in millions, except per share data)
Operating revenues
$952.8
 
$750.3
 
$843.1
 
$804.1
 
$859.6
 
$718.0
 
$866.6
 
$832.6

$843.8
 
$754.6
 
$924.6
 
$797.0
 
$897.4
 
$717.2
 
$898.9
 
$740.1
Operating income154.2
 103.3
 194.8
 91.3
 120.7
 103.2
 201.4
 108.6
145.9
 128.6
 162.6
 99.9
 152.9
 109.0
 235.9
 79.2
Amounts attributable to Alliant Energy common shareowners:                              
Income from continuing operations, net of tax108.0
 62.1
 155.2
 60.2
 72.9
 65.9
 158.9
 66.5
97.6
 84.4
 128.8
 63.0
 96.6
 68.9
 180.0
 35.2
Loss from discontinued operations, net of tax
 (0.3) (1.9) (0.2) (3.0) (0.6) (1.3) (1.0)(1.1) (0.5) (0.4) (0.3) 
 (1.3) (0.1) (1.1)
Net income108.0
 61.8
 153.3
 60.0
 69.9
 65.3
 157.6
 65.5
96.5
 83.9
 128.4
 62.7
 96.6
 67.6
 179.9
 34.1
Earnings per weighted average common share attributable to Alliant Energy common shareowners:               
Earnings per weighted average common share attributable to Alliant Energy common shareowners (a):               
Income from continuing operations, net of tax0.97
 0.56
 1.40
 0.54
 0.66
 0.59
 1.43
 0.60
0.43
 0.37
 0.57
 0.28
 0.43
 0.31
 0.79
 0.16
Loss from discontinued operations, net of tax
 
 (0.02) 
 (0.03) 
 (0.01) (0.01)
 
 
 
 
 (0.01) 
 (0.01)
Net income0.97
 0.56
 1.38
 0.54
 0.63
 0.59
 1.42
 0.59
0.43
 0.37
 0.57
 0.28
 0.43
 0.30
 0.79
 0.15

(a)
Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.

IPL - Earnings per share data is not disclosed for IPL given Alliant Energy is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented.

2014 20132016 2015
March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31
(in millions)(in millions)
Operating revenues
$528.9
 
$411.9
 
$476.2
 
$431.1
 
$477.9
 
$383.4
 
$494.4
 
$463.1

$458.7
 
$411.0
 
$516.2
 
$434.5
 
$489.0
 
$382.2
 
$504.6
 
$398.7
Operating income57.5
 34.0
 93.9
 23.8
 41.1
 34.7
 100.0
 36.2
62.0
 48.0
 125.9
 34.9
 65.5
 33.8
 117.0
 25.6
Net income46.0
 20.9
 105.1
 22.6
 31.5
 24.7
 112.6
 21.1
48.2
 34.4
 116.7
 26.5
 50.1
 19.0
 119.1
 8.0
Earnings available for common stock43.4
 18.4
 102.5
 20.1
 22.9
 22.2
 110.0
 18.5
45.6
 31.9
 114.1
 24.0
 47.5
 16.5
 116.5
 5.5

WPL - Earnings per share data is not disclosed for WPL given Alliant Energy is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented.
2014 20132016 2015
March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31March 31 June 30 Sep. 30 Dec. 31 March 31 June 30 Sep. 30 Dec. 31
(in millions)(in millions)
Operating revenues
$410.4
 
$324.5
 
$354.4
 
$359.8
 
$369.8
 
$319.9
 
$360.9
 
$355.7

$375.6
 
$334.3
 
$397.0
 
$352.2
 
$397.1
 
$324.7
 
$382.6
 
$330.7
Operating income87.7
 60.0
 93.9
 59.4
 72.7
 59.7
 95.9
 67.8
78.8
 75.0
 115.0
 58.2
 80.8
 68.3
 110.3
 49.3
Net income54.8
 34.6
 61.6
 29.8
 43.6
 34.4
 61.3
 38.2
47.0
 43.7
 69.6
 32.5
 45.1
 39.7
 68.4
 24.4
Earnings available for common stock54.8
 34.6
 61.6
 29.1
 42.0
 34.4
 61.3
 38.2
46.5
 43.2
 69.0
 31.7
 44.9
 39.2
 68.0
 24.2

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.


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ITEM 9A. CONTROLS AND PROCEDURES

Alliant Energy’s, IPL’s and WPL’s management evaluated, with the participation of each of Alliant Energy’s, IPL’s and WPL’s CEO, CFOChief Executive Officer, Chief Financial Officer and Disclosure Committee, the effectiveness of the design and operation of Alliant Energy’s, IPL’s and WPL’s disclosure controls and procedures as of the end of the quarter ended December 31, 20142016 pursuant to the requirements of the Securities Exchange Act of 1934, as amended. Based on their evaluation, the CEOChief Executive Officer and the CFOChief Financial Officer concluded that Alliant Energy’s, IPL’s and WPL’s disclosure controls and procedures were effective as of the end of the quarter ended December 31, 20142016.

The information required by Item 9A relating to “Management’s Annual Report on Internal Control over Financial Reporting” and, with respect to Alliant Energy, “Report of Independent Registered Public Accounting Firm,” is incorporated herein by reference to the relevant information in Item 8 Financial Statements and Supplementary Data. There was no change in Alliant Energy’s, IPL’s and WPL’s internal control over financial reporting that occurred during the quarter ended December 31, 20142016 that has materially affected, or is reasonably likely to materially affect, Alliant Energy’s, IPL’s orand WPL’s internal control over financial reporting.

Management’s Annual Report on Internal Control over Financial Reporting - The management of Alliant Energy, IPL and WPL are responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. Alliant Energy’s, IPL’s and WPL’s internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP.

Because of the inherent limitations of internal control over financial reporting, misstatements may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Alliant Energy’s, IPL’s and WPL’s management assessed the effectiveness of their respective internal control over financial reporting as of December 31, 2016 using the criteria set forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on these assessments, Alliant Energy’s, IPL’s and WPL’s management concluded that, as of December 31, 2016, their respective internal control over financial reporting was effective.

Deloitte & Touche LLP, Alliant Energy’s independent registered public accounting firm, has audited Alliant Energy’s internal control over financial reporting. That report is included herein. This Annual Report on Form 10-K does not include an attestation report of IPL’s and WPL’s independent registered public accounting firm regarding their respective internal control over financial reporting. Management’s report was not subject to attestation by IPL’s and WPL’s independent registered public accounting firm pursuant to rules of the SEC that permit IPL and WPL to provide only management’s report in this Annual Report on Form 10-K.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors and Shareowners of
Alliant Energy Corporation
Madison, Wisconsin

We have audited the internal control over financial reporting of Alliant Energy Corporation and subsidiaries (the “Company”) as of December 31, 2016, based on thecriteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2016, based on the criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements and financial statement schedules as of and for the year ended December 31, 2016 of the Company and our report dated February 24, 2017 expressed an unqualified opinion on those financial statements and financial statement schedules.


/s/ DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

Milwaukee, Wisconsin
February 24, 2017


ITEM 9B. OTHER INFORMATION

None.

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The directors of Alliant Energy, IPL and WPL are the same, and therefore, the information required by Item 10 relating to directors and nominees for election of directors is the same for all registrants. The information required by Item 10 relating to directors and nominees for election of directors at the 20152017 Annual Meeting of Shareowners, the timely filing of reports under Section 16 of the Securities Exchange Act of 1934, audit committees and audit committee financial experts, and Alliant Energy’s, IPL’s and WPL’s Code of Conduct is incorporated herein by reference to the relevant information under the caption “Election of Directors” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of Alliant Energy’s, IPL’s and WPL’s fiscal years. The information required by Item 10 relatingcode of ethics, also referred to as the timely filingCode of reports under Section 16Conduct, of the Securities Exchange Act of 1934 is incorporated herein by reference to the relevant information under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” in the 2015 Alliant Energy, Proxy Statement.IPL and WPL are the same. Information regarding executive officers of Alliant Energy, IPL and WPL may be found in Part I of this report under the caption “Executive Officers of the Registrants.” The information required by Item 10 relating to audit committees and audit committee financial experts is incorporated herein by reference to the relevant information under the caption “Meetings and Committees of the Board” in the 2015 Alliant Energy Proxy Statement. The code of ethics, also referred to as the Code of Conduct, of Alliant Energy, IPL and WPL are the same. The information required by Item 10 relating to Alliant Energy’s, IPL’s and WPL’s Code of Conduct is incorporated herein by reference to the relevant information under the caption “Corporate Governance” in the 2015 Alliant Energy Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION

The directors and executive officers forof Alliant Energy, IPL and WPL for which compensation information must be included are the same. Therefore, the information required by Item 11 for each of Alliant Energy, IPL and WPL is incorporated herein by reference to the relevant information under the captions “Compensation Discussion and Analysis,” “Compensation and Personnel Committee Report,” “Summary Compensation Table,” “Grants of Plan-Based Awards,” “Outstanding Equity Awards at Fiscal Year-End,” “Option Exercises and Stock Vested,” “Pension Benefits,” “Nonqualified Deferred Compensation,” “Potential Payments Upon Termination or Change in Control” and “Director Compensation” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of Alliant Energy’s, IPL’s and WPL’s fiscal years.


165



ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

ALLIANT ENERGY
Information regarding Alliant Energy’s equity compensation plans as of December 31, 20142016 was as follows:
 (A) (C) (A) (C)
 Number of securities to be (B) Number of securities remaining available Number of securities to be (B) Number of securities remaining available
 issued upon exercise of Weighted-average exercise for future issuance under equity issued upon exercise of Weighted-average exercise for future issuance under equity
 outstanding options, price of outstanding options, compensation plans (excluding outstanding options, price of outstanding options, compensation plans (excluding
Plan Category warrants and rights warrants and rights securities reflected in column (A)) warrants and rights warrants and rights securities reflected in column (A))
Equity compensation plans approved by shareowners 274,024 (a) $48.56 3,949,771 (b) 655,936 (a) $31.98 7,363,980 (b)
Equity compensation plans not approved by shareowners (c) N/A N/A N/A (d) N/A N/A N/A (d)
 274,024
 $48.56 3,949,771 655,936 $31.98 7,363,980

(a)
Represents performance shares, performance restricted stock units and restricted stock units granted under the OIP. The performancePerformance shares may be paid out in shares of Alliant Energy’s common stock, cash, or a combination of cash and stock and performance restricted stock units are paid out in shares of Alliant Energy’s common stock. The awards are adjusted by a performance multiplier, which ranges from zero to 200%, based on the performance criteria. The performance sharesshare and performance restricted stock unit awards included in column (A) of the table reflect an assumed payout in the form of Alliant Energy’s common stock at the maximum performance multiplier of 200% for the 20142016 and 20132015 grants and at the actual performance multiplierestimated payout percentage of 168%148% for the 20122014 grants.
Also included are restricted stock units granted under the OIP, which may be paid out in shares of Alliant Energy’s common stock, cash, or a combination of cash and stock at the expiration of a three-year time-vesting period.
(b)
All of the available shares under the Amended and Restated OIP may be issued as awards in the form of shares of Alliant Energy’s common stock, restricted stock, restricted stock units, performance shares, performance units and other stock-based or cash-based awards. As of December 31, 20142016, there were performance shares, restricted stock awards, performance restricted stock units and restricted stock awardsunits outstanding under the Amended and Restated OIP. Excludes 98,812190,244 shares of non-vested restricted common stock previously issued and outstanding under the Amended and Restated OIP at December 31, 2014.2016.
(c)
As of December 31, 20142016, there were 238,935441,695 shares of Alliant Energy’s common stock outstanding under the DCP, which is described in Note 12(c).
(d)There is no limit on the number of shares of Alliant Energy’s common stock that may be held under the DCP.

The remainder of the information required by Item 12 is incorporated herein by reference to the relevant information under the caption “Ownership of Voting Securities” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of Alliant Energy’s fiscal year.

IPL AND WPL
None of IPL’s directors or executive officers own any shares of preferred stock in IPL. The remainder of the information required by Item 12 is incorporated herein by reference to the relevant information under the caption “Ownership of Voting Securities” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of IPL’s and WPL’s fiscal years.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Item 13 for each of Alliant Energy, IPL and WPL is incorporated herein by reference to the relevant information under the caption “Corporate Governance” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of Alliant Energy’s, IPL’s and WPL’s fiscal years.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

ALLIANT ENERGY
The information required by Item 14 is incorporated herein by reference to the relevant information under the caption “Fees Paid to Independent Registered Public Accounting Firm” in the 20152017 Alliant Energy Proxy Statement, which will be filed with the SEC within 120 days after the end of Alliant Energy’s fiscal year.


166



IPL AND WPL
Each of IPL’s and WPL’s Audit Committee of the Board of Directors has adopted a policy that requires advance approval of all audit, audit-related, tax and other permitted services performed by the independent registered public accounting firm. The policy provides for pre-approval by the Audit Committee of specifically defined audit and non-audit services after the Audit Committee is provided with the appropriate level of details regarding the specific services to be provided. The policy does not permit delegation of the Audit Committee’s authority to management. In the event the need for specific services arises between Audit Committee meetings, the Audit Committee has delegated to the Chairperson of the Audit Committee authority to approve permitted services provided that the Chairperson reports any decisions to the Audit Committee at its next scheduled meeting. The principal accounting fees billed to Alliant Energy by its independent registered public accounting firm, all of which were approved in advance by the Audit Committee, directly related and allocated to IPL and WPL were as follows (in thousands):
IPL WPLIPL WPL
2014 2013 2014 20132016 2015 2016 2015
Fees % of Total Fees % of Total Fees % of Total Fees % of TotalFees % of Total Fees % of Total Fees % of Total Fees % of Total
Audit fees
$1,037
 91% 
$1,011
 91% 
$1,042
 96% 
$888
 92%
$1,035
 93% 
$1,036
 91% 
$1,008
 95% 
$969
 95%
Audit-related fees88
 8% 81
 7% 38
 3% 57
 6%64
 6% 90
 8% 41
 4% 41
 4%
Tax fees
 % 14
 1% 
 % 11
 1%
All other fees9
 1% 5
 1% 9
 1% 5
 1%8
 1% 7
 1% 7
 1% 7
 1%

$1,134
 100% 
$1,111
 100% 
$1,089
 100% 
$961
 100%
$1,107
 100% 
$1,133
 100% 
$1,056
 100% 
$1,017
 100%

IPL’s and WPL’s audit fees for 20142016 and 20132015 consisted of the respective fees billed for the audits of the financial statements of IPL and its subsidiary and WPL and its subsidiary, for reviews of financial statements included in Form 10-Q filings, and for services normally provided in connection with statutory and regulatory filings, such as financing transactions. IPL’s and WPL’s audit fees also included their respective portion of fees for the 20142016 and 20132015 audits of Alliant Energy’s financial statements and effectiveness of internal controls over financial reporting. IPL’s and WPL’s audit-related fees for 20142016 and 20132015 consisted of the fees billed for services rendered related to employee benefits plan audits and other attest services not required by statute or regulations. IPL’s and WPL’s tax fees for 2013 consisted of the fees billed for professional services rendered for tax compliance, tax advice and tax planning, including all services performed by the tax professional staff of affiliates of the independent registered public accounting firm, except those rendered in connection with the audit.services. All other fees for 20142016 and 20132015 for IPL and WPL consisted of license fees for accounting research software products and seminars. IPL and WPL did not have any tax fees for 2016 or 2015. The Audit Committee does not consider the provision of non-audit services by the independent registered public accounting firm described above to be incompatible with maintaining independence of the independent registered public accounting firm.


PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(1)
Consolidated Financial Statements - Refer to Item 8 Financial Statements and Supplementary Data.

(2)
Financial Statement Schedules -
Schedule I. Condensed Parent Company Financial Statements
Schedule II. Valuation and Qualifying Accounts and Reserves

NOTE: All other schedules are omitted because they are not applicable or not required, or because that required information is shown either in the financial statements or in the notes thereto.

(3)
Exhibits Required by SEC Regulation S-K - Exhibits for Alliant Energy, IPL and WPL are listed in the Exhibit Index, which is incorporated herein by reference.


167



SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS

ALLIANT ENERGY CORPORATION
(Parent (Parent Company Only)
CONDENSED STATEMENTS OF INCOME
Year Ended December 31,Year Ended December 31,
2014 2013 20122016 2015 2014
(in millions)(in millions)
Operating revenues
$2
 
$2
 
$2

$1
 
$2
 
$2
Operating expenses3
 1
 1
3
 3
 3
Operating income (loss)(1) 1
 1
Operating loss(2) (1) (1)
Interest expense and other:          
Equity earnings from consolidated subsidiaries(387) (362) (322)(374) (379) (388)
Interest expense9
 11
 11
3
 3
 9
Interest income(2) (2) (4)(2) (3) (2)
Total interest expense and other(380) (353) (315)(373) (379) (381)
Income before income taxes379
 354
 316
371
 378
 380
Income tax benefit(4) (4) (4)(1) (1) (3)
Net income
$383
 
$358
 
$320

$372
 
$379
 
$383
The accompanying Notes to Condensed Financial Statements are an integral part of these statements.


ALLIANT ENERGY CORPORATION (Parent Company Only)
CONDENSED BALANCE SHEETS
 December 31,
 2016 2015
 (in millions)
ASSETS   
Current assets:   
Notes receivable from affiliated companies
$74
 
$93
Other5
 9
Total current assets79
 102
Investments:   
Investments in consolidated subsidiaries4,211
 3,999
Other2
 14
Total investments4,213
 4,013
Other assets64
 20
Total assets
$4,356
 
$4,135
LIABILITIES AND EQUITY   
Current liabilities:   
Current maturities of long-term debt
$—
 
$250
Commercial paper192
 140
Notes payable to affiliated companies275
 
Other12
 12
Total current liabilities479
 402
Other liabilities18
 12
Common equity:   
Common stock and additional paid-in capital1,695
 1,664
Retained earnings2,174
 2,066
Shares in deferred compensation trust(10) (9)
Total common equity3,859
 3,721
Total liabilities and equity
$4,356
 
$4,135
The accompanying Notes to Condensed Financial Statements are an integral part of these statements.


ALLIANT ENERGY CORPORATION (Parent Company Only)
CONDENSED STATEMENTS OF CASH FLOWS

Year Ended December 31,

2016
2015
2014

(in millions)
Net cash flows from operating activities
$254


$262


$246
Cash flows from (used for) investing activities:







Capital contributions to consolidated subsidiaries(250)
(165)
(90)
Capital repayments from consolidated subsidiaries130



50
Net change in notes receivable from and payable to affiliates294
 2
 (23)
Other10




Net cash flows from (used for) investing activities184

(163)
(63)
Cash flows used for financing activities:







Common stock dividends(267)
(247)
(226)
Proceeds from issuance of common stock, net27
 151
 
Proceeds from issuance of long-term debt
 
 250
Payments to retire long-term debt(250) 
 (250)
Net change in commercial paper52

(1)
45
Other

(2)
(2)
Net cash flows used for financing activities(438)
(99)
(183)
Net decrease in cash and cash equivalents




Cash and cash equivalents at beginning of period




Cash and cash equivalents at end of period
$—


$—


$—
Supplemental cash flows information:







Cash paid during the period for:







Interest, net of capitalized interest
($3)

($3)

($11)
Income taxes, net(37)
(9)
(5)
The accompanying Notes to Condensed Financial Statements are an integral part of these statements.

ALLIANT ENERGY CORPORATION
(Parent Company Only)
CONDENSED BALANCE SHEETS
 December 31,
 2014 2013
 (in millions)
ASSETS   
Current assets:   
Notes receivable from affiliated companies
$95
 
$72
Other4
 3
 99
 75
Investments:   
Investments in consolidated subsidiaries3,753
 3,585
Other15
 14
 3,768
 3,599
Other assets10
 6
Total assets
$3,877
 
$3,680

The accompanying Notes to Condensed Financial Statements are an integral part of these statements.


168



ALLIANT ENERGY CORPORATION
(Parent Company Only)
CONDENSED BALANCE SHEETS (continued)
 December 31,
 2014 2013
 (in millions)
LIABILITIES AND EQUITY   
Current liabilities:   
Current maturities of long-term debt
$—
 
$250
Commercial paper141
 96
Other29
 10
 170
 356
Long-term debt, net250
 
Other liabilities:   
Deferred income taxes11
 39
Other11
 7
 22
 46
Common equity:   
Common stock and additional paid-in capital1,510
 1,509
Retained earnings1,934
 1,777
Shares in deferred compensation trust(9) (8)
 3,435
 3,278
Total liabilities and equity
$3,877
 
$3,680

The accompanying Notes to Condensed Financial Statements are an integral part of these statements.

ALLIANT ENERGY CORPORATION
(Parent Company Only)
CONDENSED STATEMENTS OF CASH FLOWS

Year Ended December 31,

2014
2013
2012

(in millions)
Net cash flows from operating activities
$246


$238


$260
Cash flows used for investing activities:







Capital contributions to consolidated subsidiaries(90)
(120)
(230)
Capital repayments from consolidated subsidiaries50

95


Net change in notes receivable from affiliates(23) 5
 134
Other

(2)
1
Net cash flows used for investing activities(63)
(22)
(95)
Cash flows used for financing activities:







Common stock dividends(226)
(208)
(199)
Proceeds from issuance of long-term debt250
 
 
Payments to retire long-term debt(250) 
 
Net change in commercial paper45

(9)
35
Other(2)
1

(1)
Net cash flows used for financing activities(183)
(216)
(165)
Net decrease in cash and cash equivalents




Cash and cash equivalents at beginning of period




Cash and cash equivalents at end of period
$—


$—


$—
Supplemental cash flows information:







Cash (paid) refunded during the period for:







Interest, net of capitalized interest
($11)

($13)

($11)
Income taxes, net(5)
(7)
29

The accompanying Notes to Condensed Financial Statements are an integral part of these statements.


169



ALLIANT ENERGY CORPORATION
(Parent Company Only)
NOTES TO CONDENSED FINANCIAL STATEMENTS

Pursuant to rules and regulations of the SEC, the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only) do not reflect all of the information and notes normally included with financial statements prepared in accordance with GAAP. Therefore, these Condensed Financial Statements should be read in conjunction with the Financial Statements and related Notes included in Alliant Energy’sthe combined 20142016 Form 10-K, Part II, Item 8, which is incorporated herein by reference.

In the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only), investments in subsidiaries are accounted for using the equity method.


SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
    Additions  
 Balance,Charged toCharged to Other Balance,
DescriptionJanuary 1ExpenseAccounts (a)Deductions (b)December 31
 (in millions)
Valuation and Qualifying Accounts Which are Deducted in the Balance Sheet From the Assets to Which They Apply:
 Accumulated Provision for Uncollectible Accounts:    
  Alliant Energy (c)     
   Year ended December 31, 2014
$4.8

$11.7

$4.1

$15.5

$5.1
   Year ended December 31, 20134.0
13.6
0.6
13.4
4.8
   Year ended December 31, 20124.2
6.6
1.2
8.0
4.0
  IPL (c)    
   Year ended December 31, 2014
$0.7

$11.5

$—

$11.8

$0.4
   Year ended December 31, 20130.7
12.7

12.7
0.7
   Year ended December 31, 20120.9
6.4

6.6
0.7
  WPL    
   Year ended December 31, 2014
$1.7

$—

$4.1

$1.6

$4.2
   Year ended December 31, 20131.8

0.6
0.7
1.7
   Year ended December 31, 20121.9
0.1
1.2
1.4
1.8
 Accumulated Provision for Uncollectible Accounts:    
  Alliant Energy (c)     
   Year ended December 31, 2016
$4.8

$17.4

$8.8

$22.3

$8.7
   Year ended December 31, 20155.1
8.1
3.0
11.4
4.8
   Year ended December 31, 20144.8
11.7
4.1
15.5
5.1
  IPL (c)    
   Year ended December 31, 2016
$0.6

$17.2

$—

$16.7

$1.1
   Year ended December 31, 20150.4
8.1

7.9
0.6
   Year ended December 31, 20140.7
11.5

11.8
0.4
  WPL    
   Year ended December 31, 2016
$3.7

$0.1

$8.8

$5.5

$7.1
   Year ended December 31, 20154.2

3.0
3.5
3.7
   Year ended December 31, 20141.7

4.1
1.6
4.2
Note: The above provisions relate to various customer, notes and other receivable balances included in various line items on the respective balance sheets.

Other Reserves:
 Accumulated Provision for Other Reserves (d):
  Alliant Energy    
   Year ended December 31, 2014
$38.2

$12.5

$—

$18.1

$32.6
   Year ended December 31, 201333.4
23.2

18.4
38.2
   Year ended December 31, 201225.9
9.6

2.1
33.4
  IPL    
   Year ended December 31, 2014
$18.1

$3.9

$—

$11.4

$10.6
   Year ended December 31, 201311.6
9.3

2.8
18.1
   Year ended December 31, 201210.2
2.1

0.7
11.6
  WPL    
   Year ended December 31, 2014
$16.2

$2.5

$—

$2.4

$16.3
   Year ended December 31, 201313.5
8.8

6.1
16.2
   Year ended December 31, 201211.7
3.1

1.3
13.5
 Accumulated Provision for Other Reserves (d):
  Alliant Energy    
   Year ended December 31, 2016
$27.1

$6.1

$—

$8.1

$25.1
   Year ended December 31, 201532.6
6.5

12.0
27.1
   Year ended December 31, 201438.2
12.5

18.1
32.6
  IPL    
   Year ended December 31, 2016
$9.4

$1.0

$—

$1.7

$8.7
   Year ended December 31, 201510.6
2.1

3.3
9.4
   Year ended December 31, 201418.1
3.9

11.4
10.6
  WPL    
   Year ended December 31, 2016
$11.4

$1.8

$—

$5.1

$8.1
   Year ended December 31, 201516.3
0.7

5.6
11.4
   Year ended December 31, 201416.2
2.5

2.4
16.3

(a)Accumulated provision for uncollectible accounts: In accordance with its regulatory treatment, certain amounts provided by WPL are recorded in regulatory assets. WPL expenses these amounts when an uncollectible account is written-off.
(b)Deductions are of the nature for which the reserves were created. In the case of the accumulated provision for uncollectible accounts, deductions from this reserve are reduced by recoveries of amounts previously written off.
(c)
Refer to Note 5(b) for discussion of IPL’s sales of accounts receivable program.
(d)Other reserves are largely related to injury and damage claims arising in the ordinary course of business.

170



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant hasRegistrants have duly caused this report to be signed on itstheir behalf by the undersigned, thereunto duly authorized on the 24th day of February 2015.

ALLIANT ENERGY CORPORATION2017.
ALLIANT ENERGYINTERSTATE POWERWISCONSIN POWER
CORPORATIONAND LIGHT COMPANYAND LIGHT COMPANY
By: /s/ Patricia L. Kampling
By: /s/ Patricia L. Kampling
 
By: /s/ Patricia L. Kampling
Patricia L. Kampling
Chairman, President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on the 24th day of February 2015.
/s/Patricia L. KamplingChairman, President, Chief Executive Officer and Director (Principal Executive Officer)
 Patricia L. Kampling 
/s/Thomas L. HansonSenior Vice President and Chief Financial Officer (Principal Financial Officer)
Thomas L. Hanson
/s/Robert J. DurianController and Chief Accounting Officer (Principal Accounting Officer)
Robert J. Durian
/s/Patrick E. AllenDirector
Patrick E. Allen
/s/Michael L. BennettDirector
Michael L. Bennett
/s/Darryl B. HazelDirector
Darryl B. Hazel
/s/Singleton B. McAllisterDirector
Singleton B. McAllister
/s/Ann K. NewhallDirector
Ann K. Newhall
/s/Dean C. OestreichDirector
Dean C. Oestreich
/s/Carol P. SandersDirector
Carol P. Sanders
/s/Susan D. WhitingDirector
Susan D. Whiting

171



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on the 24th day of February 2015.

INTERSTATE POWER AND LIGHT COMPANY
By: /s/ Patricia L. Kampling
Patricia L. Kampling
Chairman, President and Chief Executive OfficerChairman and Chief Executive Officer Chairman and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrantRegistrants and in the capacities indicated on the 24th day of February 2015.2017.
ALLIANT ENERGYINTERSTATE POWERWISCONSIN POWER
CORPORATIONAND LIGHT COMPANYAND LIGHT COMPANY
By: /s/ Patricia L. Kampling
By: /s/ Patricia L. Kampling
By: /s/ Patricia L. Kampling
Patricia L. KamplingPatricia L. KamplingPatricia L. Kampling
Chairman, President, Chief Executive Officer and Director (Principal Executive Officer)Chairman, Chief Executive Officer and Director (Principal Executive Officer) Chairman, Chief Executive Officer and Director (Principal Executive Officer)
 Patricia L. Kampling  
/s/ Robert J. Durian/s/ Robert J. Durian/s/ Robert J. Durian
Robert J. DurianRobert J. DurianRobert J. Durian
Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)
    
/s/Thomas L. Hanson Benjamin M. Bilitz Senior Vice President/s/ Benjamin M. Bilitz/s/ Benjamin M. Bilitz
Benjamin M. BilitzBenjamin M. BilitzBenjamin M. Bilitz
Chief Accounting Officer and Controller (Principal Accounting Officer)Chief FinancialAccounting Officer and Controller (Principal FinancialAccounting Officer)Chief Accounting Officer and Controller (Principal Accounting Officer)
 Thomas L. Hanson
    
/s/Robert J. DurianController and Chief Accounting Officer (Principal Accounting Officer)
Robert J. Durian
/s/Patrick E. Allen Director
/s/ Patrick E. Allen /s/ Patrick E. Allen
Patrick E. Allen, DirectorPatrick E. Allen, DirectorPatrick E. Allen, Director
    
/s/Michael L. Bennett Director
/s/ Michael L. Bennett /s/ Michael L. Bennett
Michael L. Bennett, DirectorMichael L. Bennett, DirectorMichael L. Bennett, Director
    
/s/Darryl Deborah B. HazelDunie /s/ Deborah B. Dunie/s/ Deborah B. Dunie
Deborah B. Dunie, DirectorDeborah B. Dunie, DirectorDeborah B. Dunie, Director
 Darryl B. Hazel
    
/s/Singleton Darryl B. McAllisterHazel /s/ Darryl B. Hazel/s/ Darryl B. Hazel
Darryl B. Hazel, DirectorDarryl B. Hazel, DirectorDarryl B. Hazel, Director
 Singleton B. McAllister
    
/s/Ann K. Newhall Singleton B. McAllister /s/ Singleton B. McAllister/s/ Singleton B. McAllister
Singleton B. McAllister, DirectorSingleton B. McAllister, DirectorSingleton B. McAllister, Director
 Ann K. Newhall
    
/s/Dean C. Oestreich Thomas F. O’Toole /s/ Thomas F. O’Toole/s/ Thomas F. O’Toole
Thomas F. O’Toole, DirectorThomas F. O’Toole, DirectorThomas F. O’Toole, Director
 Dean C. Oestreich
    
/s/Carol P. Sanders Dean C. Oestreich /s/ Dean C. Oestreich/s/ Dean C. Oestreich
Dean C. Oestreich, DirectorDean C. Oestreich, DirectorDean C. Oestreich, Director
 Carol P. Sanders
    
/s/Susan D. Whiting Carol P. Sanders /s/ Carol P. Sanders/s/ Carol P. Sanders
Carol P. Sanders, DirectorCarol P. Sanders, DirectorCarol P. Sanders, Director
 Susan D. Whiting

172



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on the 24th day of February 2015.

WISCONSIN POWER AND LIGHT COMPANY
By: /s/ Patricia L. Kampling
Patricia L. Kampling
Chairman and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on the 24th day of February 2015.
/s/Patricia L. KamplingChairman, Chief Executive Officer and Director (Principal Executive Officer)
Patricia L. Kampling
    
/s/Thomas L. HansonSenior Vice President and Chief Financial Officer (Principal Financial Officer)
Thomas L. Hanson
/s/Robert J. DurianController and Chief Accounting Officer (Principal Accounting Officer)
Robert J. Durian
/s/Patrick E. AllenDirector
Patrick E. Allen
/s/Michael L. BennettDirector
Michael L. Bennett
/s/Darryl B. HazelDirector
Darryl B. Hazel
/s/Singleton B. McAllisterDirector
Singleton B. McAllister
/s/Ann K. NewhallDirector
Ann K. Newhall
/s/Dean C. OestreichDirector
Dean C. Oestreich
/s/Carol P. SandersDirector
Carol P. Sanders
/s/Susan D. Whiting Director
/s/ Susan D. Whiting /s/ Susan D. Whiting
Susan D. Whiting, DirectorSusan D. Whiting, DirectorSusan D. Whiting, Director


173



ALLIANT ENERGY CORPORATION
INTERSTATE POWER AND LIGHT COMPANY
WISCONSIN POWER AND LIGHT COMPANY

EXHIBIT INDEX

The following Exhibits are filed herewith or incorporated herein by reference.

Pursuant to Item 601(b)(4)(iii) of Regulation S-K, the registrants agree to furnish to the Securities and Exchange Commission, upon request, any instrument defining the rights of holders of unregistered long-term debt not filed as an exhibit to this combined Form 10-K. No such instrument authorizes securities in excess of 10% of the total assets of Alliant Energy, IPL or WPL, as the case may be.
Exhibit Number Description
3.1 Restated Articles of Incorporation of Alliant Energy, as amended (incorporated by reference to Exhibit 4.1 to Alliant Energy’s Registration Statement on Form S-8 (Reg. No. 333-117654))
3.1a Articles of Amendment to Restated Articles of Incorporation of Alliant Energy, as amended, effective May 4, 2016 (incorporated by reference to Exhibit 3.1 to Alliant Energy’s Form 10-Q for the quarter ended March 31, 2016 (File No. 1-9894))
3.2 Amended and Restated Bylaws of Alliant Energy, effective May 10, 20137, 2015 (incorporated by reference to Exhibit 3.1 to Alliant Energy’s Form 8-K, filed May 13, 20132015 (File No. 1-9894))
3.3 Amended and Restated Articles of Incorporation of WPL, effective May 9, 2013 (incorporated by reference to Exhibit 3.4 to WPL’s Form 8-K, filed May 13, 2013 (File No. 0-337))
3.4 Amended and Restated Bylaws of WPL, effective May 10, 20137, 2015 (incorporated by reference to Exhibit 3.53.3 to WPL’s Form 8-K, filed May 13, 20132015 (File No. 0-337))
3.5 Amended and Restated Articles of Incorporation of IPL, effective May 10, 2013 (incorporated by reference to Exhibit 3.2 to IPL’s Form 8-K, filed May 13, 2013 (File No. 1-4117))
3.6 Amended and Restated Bylaws of IPL, effective May 10, 20137, 2015 (incorporated by reference to Exhibit 3.33.2 to IPL’s Form 8-K, filed May 13, 20132015 (File No. 1-4117))
4.1 Third Amended and Restated Five Year Credit Agreement, dated December 14, 2011, among Alliant Energy and the Banks set forth therein (incorporated by reference to Exhibit 99.1 to Alliant Energy’s Form 8-K, filed December 19, 2011 (File No. 1-9894))
4.2 Senior Note Indenture, dated as of September 30, 2009, between Alliant Energy and Wells Fargo Bank, N.A.National Association (N.A.) (incorporated by reference to Exhibit 4.28 to Alliant Energy’s Registration Statement on Form S-3 (Reg. No. 333-162214))
4.3 Amended and Restated Rights Agreement, dated as of December 11, 2008, between Alliant Energy and Wells Fargo Bank, N.A. (incorporated by reference to Exhibit 4.1 to Alliant Energy’s Registration Statement on Form 8-A/A, filed December 12, 2008 (File No. 1-9894))
4.4 Third Amended and Restated Five Year Credit Agreement, dated December 14, 2011, among WPL and the Banks set forth therein (incorporated by reference to Exhibit 99.3 to WPL’s Form 8-K, filed December 19, 2011 (File No. 0-337))
4.5 Indenture, dated as of June 20, 1997, between WPL and Wells Fargo Bank, N.A., Successor, as Trustee (incorporated by reference to Exhibit 4.33 to Amendment No. 2 to WPL’s Registration Statement on Form S-3 (Reg. No. 033-60917))
4.6 Officers’ Certificate, dated as of July 28, 2004, creating WPL’s 6.25% Debentures due July 31, 2034 (incorporated by reference to Exhibit 4.1 to WPL’s Form 8-K, filed August 2, 2004 (File No. 0-337))
4.7 Officers’ Certificate, dated as of August 8, 2007, creating WPL’s 6.375% Debentures due August 15, 2037 (incorporated by reference to Exhibit 4.1 to WPL’s Form 8-K, filed August 9, 2007 (File No. 0-337))
4.8 Officer’s Certificate, dated as of October 1, 2008, creating WPL’s 7.60% Debentures due October 1, 2038 (incorporated by reference to Exhibit 4.2 to WPL’s Form 8-K, filed October 2, 2008 (File No. 0-337))
4.9 Officers’ Certificate, dated as of July 7, 2009, creating WPL’s 5.00% Debentures due July 15, 2019 (incorporated by reference to Exhibit 4.2 to WPL’s Form 8-K, filed July 8, 2009 (File No. 0-337))
4.10 Officers’ Certificate, dated as of June 10, 2010, creating WPL’s 4.60% Debentures due June 15, 2020 (incorporated by reference to Exhibit 4.2 to WPL’s Form 8-K, filed June 11, 2010 (File No. 0-337))
4.11 Officers’ Certificate, dated as of November 19, 2012, creating WPL’s 2.25% Debentures due November 15, 2022 (incorporated by reference to Exhibit 4.1 to WPL’s Form 8-K, filed November 19, 2012 (File No. 0-337))

174



4.12 Officers’ Certificate, dated as of October 14, 2014, creating WPL’s 4.10% Debentures due October 15, 2044 (incorporated by reference to Exhibit 4.1 to WPL’s Form 8-K, filed October 14, 2014 (File No. 0-337))
4.13 Third Amended and Restated Five Year Credit Agreement, dated December 14, 2011, among IPL and the Banks set forth therein (incorporated by reference to Exhibit 99.2 to IPL’s Form 8-K, filed December 19, 2011 (File No. 1-4117))

Exhibit Number Description
4.14 Indenture (For Senior Unsecured Debt Securities), dated as of August 20, 2003, between IPL and The Bank of New York Mellon Trust Co., N.A. (f/k/a The Bank of New York Trust Co., N.A.), as Trustee (incorporated by reference to Exhibit 4.11 to IPL’s Registration Statement on Form S-3 (Reg. No. 333-108199))
4.15 Officer’s Certificate, dated as of September 10, 2003, creating IPL’s 5.875% Senior Debentures due September 15, 2018 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed September 11, 2003 (File No. 1-4117))
4.16 Officer’s Certificate, dated as of October 14, 2003, creating IPL’s 6.45% Senior Debentures due October 15, 2033 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed October 15, 2003 (File No. 1-4117))
4.17 Officer’s Certificate, dated as of May 3, 2004, creating IPL’s 6.30% Senior Debentures due May 1, 2034 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed May 5, 2004 (File No. 1-4117))
4.17a Officer’s Certificate, dated as of August 2, 2004, reopening IPL’s 6.30% Senior Debentures due May 1, 2034 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed August 5, 2004 (File No. 1-4117))
4.18 Officer’s Certificate, dated as of July 18, 2005, creating IPL’s 5.50% Senior Debentures due July 15, 2025 (incorporated by reference to Exhibit 4 to IPL’s Form 8-K, filed July 19, 2005 (File No. 1-4117))
4.19 Officer’s Certificate, dated as of October 1, 2008, creating IPL’s 7.25% Senior Debentures due October 1, 2018 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed October 2, 2008 (File No. 1-4117))
4.20 Officer’s Certificate, dated as of July 7, 2009, creating IPL’s 6.25% Senior Debentures due July 15, 2039 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed July 8, 2009 (File No. 1-4117))
4.21Officer’s Certificate, dated as of June 10, 2010, creating IPL’s 3.30% Senior Debentures due June 15, 2015 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed June 11, 2010 (File No. 1-4117))
4.22 Officer’s Certificate, dated as of August 23, 2010, creating IPL’s 3.65% Senior Debentures due September 1, 2020 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed August 24, 2010 (File No. 1-4117))
4.234.22 Officer’s Certificate, dated as of October 8, 2013, creating IPL’s 4.70% Senior Debentures due October 15, 2043 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed October 8, 2013 (File No. 1-4117))
4.244.23 Officer’s Certificate, dated as of November 24, 2014, creating IPL’s 3.25% Senior Debentures due December 1, 2024 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed November 24, 2014 (File No. 1-4117))
4.24 Officer’s Certificate, dated as of August 18, 2015, creating IPL’s 3.40% Senior Debentures due August 15, 2025 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed August 18, 2015 (File No. 1-4117))
4.25Officer’s Certificate, dated as of September 15, 2016, creating IPL’s 3.70% Senior Debentures due September 15, 2046 (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed September 15, 2016 (File No. 1-4117))
4.26 Form of Preferred Stock Certificate of IPL (incorporated by reference to Exhibit 4.1 to IPL’s Form 8-K, filed March 20, 2013 (File No. 1-4117))
10.1 Operating Agreement of ATC, dated as of January 1, 2001 (incorporated by reference to Exhibit 10.16 to WPL’s Form 10-K for the year 2000 (File No. 0-337))
10.2 Term Loan Credit Agreement, dated as of October 7, 2014, between2016, among AEF, Alliant Energy, Wells FargoJPMorgan Chase Bank, N.A. and the lender parties set forth therein (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed October 14, 20147, 2016 (File No. 1-9894))
10.3# OIP (incorporated by reference to Appendix A to Alliant Energy’s definitive proxy statement filed on Schedule 14A on April 1, 2010 (File No. 1-9894))
10.3a# Amendment to the OIP (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.3b# Form of Performance Share Agreement pursuant to the OIP, amended in 2012 (incorporated by reference to Exhibit 10.4c to Alliant Energy’s Form 10-K for the year 2011 (File No. 1-9894))
10.3c# Form of Performance Share Agreement amended in 2015, pursuant to the OIP, amended in 2012
(incorporated by reference to Exhibit 10.3c to Alliant Energy’s Form 10-K for the year 2014 (File No. 1-9894))
10.3d# Form of Performance Contingent Restricted Stock Agreement pursuant to the OIP, amended in 2012 (incorporated by reference to Exhibit 10.4e to Alliant Energy’s Form 10-K for the year 2011 (File No. 1-9894))
10.3e# Form of Performance Contingent Restricted Stock Agreement amended in 2015, pursuant to the OIP, amended in 2012 (incorporated by reference to Exhibit 10.3e to Alliant Energy’s Form 10-K for the year 2014 (File No. 1-9894))
10.4#Amended and Restated OIP, amended in 2015 (incorporated by reference to Appendix A to Alliant Energy’s definitive proxy statement filed on Schedule 14A on March 24, 2015 (File No. 1-9894))
10.4a#Form of Performance Share Agreement pursuant to the Amended and Restated OIP, amended in 2015 (incorporated by reference to Exhibit 10.4a to Alliant Energy’s Form 10-K for the year 2015 (File No. 1-9894))
10.4b#Form of Restricted Stock Unit Agreement pursuant to the Amended and Restated OIP, amended in 2015 (incorporated by reference to Exhibit 10.4b to Alliant Energy’s Form 10-K for the year 2015 (File No. 1-9894))

175



Exhibit Number Description
10.4#10.4c#Form of Performance Restricted Stock Unit Agreement pursuant to the Amended and Restated OIP, amended in 2015 (incorporated by reference to Exhibit 10.4c to Alliant Energy’s Form 10-K for the year 2015 (File No. 1-9894))
10.5# DLIP, for director-level employees, amended in 2012 (incorporated by reference to Exhibit 10.5c to Alliant Energy’s Form 10-K for the year 2011 (File No. 1-9894))
10.4a#10.5a# Form of Restricted Cash Agreement pursuant to the DLIP, amended in 2012 (incorporated by reference to Exhibit 10.5d to Alliant Energy’s Form 10-K for the year 2011 (File No. 1-9894))
10.4b#10.5b# Form of Performance Restricted Award Agreement pursuant to the DLIP, amended in 2012 (incorporated by reference to Exhibit 10.5e to Alliant Energy’s Form 10-K for the year 2011 (File No. 1-9894))
10.6# DLIP, for director-level employees, amended in 2016
10.5#10.6a#Form of Performance Unit Agreement pursuant to the DLIP, amended in 2016
10.6b#Form of Performance Restricted Unit Agreement pursuant to the DLIP, amended in 2016
10.6c#Form of Restricted Unit Agreement pursuant to the DLIP, amended in 2016
10.7# DCP, as amended and restated effective January 1, 2011 (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed December 14, 2010 (File No. 1-9894))
10.5a#10.7a# Amendment to the DCP, as amended and restated (incorporated by reference to Exhibit 10.2 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.8# IES Industries Inc. Amended and Restated Key Employee Deferred Compensation Agreement, as amended (incorporated by reference to Exhibit 10.7 to Alliant Energy’s Form 10-K for the year 2015 (File No. 1-9894))
10.6#10.9# Alliant Energy Rabbi Trust Agreement for DCPs (incorporated by reference to Exhibit 10.19 to Alliant Energy’s Form 10-K for the year 2005 (File No. 1-9894))
10.9a# Amendment to the Alliant Energy Rabbi Trust Agreement for DCPs (incorporated by reference to Exhibit 10.2 to Alliant Energy’s Form 10-Q for the quarter ended June 30, 2015 (File No. 1-9894))
10.7#10.9b#Second Amendment to the Alliant Energy Rabbi Trust Agreement for DCPs (incorporated by reference to Exhibit 10.3 to Alliant Energy’s Form 10-Q for the quarter ended June 30, 2015 (File No. 1-9894))
10.10# Alliant Energy Excess Retirement Plan (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 10-Q for the quarter ended September 30, 2008 (File No. 1-9894))
10.7a#10.10a# Amendment to the Alliant Energy Excess Retirement Plan (incorporated by reference to Exhibit 10.4 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.8#10.11# Form of SRPSupplemental Retirement Plan (SRP) Agreement by and between Alliant Energy and each of T.L. Hanson, P.L. Kampling and J.O. Larsen (incorporated by reference to Exhibit 10.3 to Alliant Energy’s Form 8-K, filed December 12, 2008 (File No. 1-9894))
10.9#10.12# Alliant Energy Defined Contribution SRP (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 10-Q for the quarter ended September 30, 2010 (File No. 1-9894))
10.9a#10.12a# Amendment to the Alliant Energy Defined Contribution SRP (incorporated by reference to Exhibit 10.3 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.9b#10.12b# Amendment to the Alliant Energy Defined Contribution SRP (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed March 12, 2014 (File No. 1-9894))
10.10#10.13# Form of KEESA,Key Executive Employment and Severance Agreement (KEESA), by and between Alliant Energy and P.L. Kampling (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed October 29, 2010 (File No. 1-9894))
10.11#10.14# Form of KEESA, by and between Alliant Energy and each of J.H. Gallegos, T.L. Hanson, D.R. Kopp, and J.O. Larsen, W.A. Reschke and R.J. Durian (incorporated by reference to Exhibit 10.3 to Alliant Energy’s Form 10-Q for the quarter ended June 30, 2008 (File No. 1-9894))
10.14a# Form of Amendment to KEESA, by and between Alliant Energy and each of J.H. Gallegos, T.L. Hanson, D.R. Kopp, J.O. Larsen, W.A. Reschke and R.J. Durian (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 10-Q for the quarter ended September 30, 2015 (File No. 1-9894))
10.12#10.15# Form of Amendment Number One to KEESA, by and between Alliant Energy and each of P.L. Kampling, J.H. Gallegos, T.L. Hanson, D.R. Kopp, and J.O. Larsen, W.A. Reschke and R.J. Durian (incorporated by reference to Exhibit 10.6 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.13#Form of KEESA, by and between Alliant Energy and R.J. Durian
10.14#10.16# Executive Severance Benefit under the Alliant Energy Severance Plan Summary Plan Description, effective March 19, 2008 (incorporated by reference to Exhibit 10.1 to Alliant Energy’s Form 8-K, filed March 24, 2008 (File No. 1-9894))
10.14a#10.16a# Amendment to the Executive Severance Benefit under the Alliant Energy Severance Plan Summary Plan Description (incorporated by reference to Exhibit 10.5 to Alliant Energy’s Form 8-K, filed December 5, 2011 (File No. 1-9894))
10.17# 
10.15#Executive Employee Reimbursement Agreement, by and betweenTerms of Alliant Energy and R.J. DurianExecutive Performance Pay Plan (incorporated by reference to Exhibit 10.1310.18 to Alliant Energy’s Form 10-K for the year 20132015 (File No. 1-9894))
10.16#Terms of Alliant Energy Management Performance Pay Plan
10.17#10.18# Summary of Compensation and Benefits for Non-Employee Directors of Alliant Energy, IPL and WPL, effective January 1, 2015
2017
12.1 Ratio of Earnings to Fixed Charges for Alliant Energy

Exhibit Number Description
12.2 Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined Fixed Charges and Preferred Dividend Requirements for IPL
12.3 Ratio of Earnings to Fixed Charges for WPL
21.1 Subsidiaries of Alliant Energy
21.2 Subsidiaries of WPL

176



23.1 Consent of Independent Registered Public Accounting Firm for Alliant Energy
23.2 Consent of Independent Registered Public Accounting Firm for IPL
23.3 Consent of Independent Registered Public Accounting Firm for WPL
31.1 Certification of the Chairman, President and CEOChief Executive Officer for Alliant Energy
31.2 Certification of the Senior VPVice President, Chief Financial Officer and CFOTreasurer for Alliant Energy
31.3 Certification of the Chairman and CEOChief Executive Officer for IPL
31.4 Certification of the Senior VPVice President, Chief Financial Officer and CFOTreasurer for IPL
31.5 Certification of the Chairman and CEOChief Executive Officer for WPL
31.6 Certification of the Senior VPVice President, Chief Financial Officer and CFOTreasurer for WPL
32.1 Written Statement of the CEOChief Executive Officer and CFOChief Financial Officer Pursuant to 18 U.S.C.§1350 for Alliant Energy
32.2 Written Statement of the CEOChief Executive Officer and CFOChief Financial Officer Pursuant to 18 U.S.C.§1350 for IPL
32.3 Written Statement of the CEOChief Executive Officer and CFOChief Financial Officer Pursuant to 18 U.S.C.§1350 for WPL
101.INS 
101.INS*XBRLExtensible Business Reporting Language (XBRL) Instance Document
101.SCH*101.SCH XBRL Taxonomy Extension Schema Document
101.CAL*101.CAL XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*101.LAB XBRL Taxonomy Extension Label Linkbase Document
101.PRE*101.PRE XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*101.DEF XBRL Taxonomy Extension Definition Linkbase Document

# A management contract or compensatory plan or arrangement.
* Filed as Exhibit 101 to this report are the following documents formatted in Extensible Business Reporting Language (XBRL): (i) Alliant Energy’s, IPL’s and WPL’s Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012; (ii) Alliant Energy’s, IPL’s and WPL’s Consolidated Balance Sheets as of December 31, 2014 and 2013; (iii) Alliant Energy’s, IPL’s and WPL’s Consolidated Statements of Cash Flows for the years ended December 31, 2014, 2013 and 2012; (iv) Alliant Energy’s and IPL’s Consolidated Statements of Common Equity and WPL’s Consolidated Statements of Equity for the years ended December 31, 2014, 2013 and 2012; and (v) the Combined Notes to Consolidated Financial Statements.


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